There are moments in the arts when someone builds something so organically that by the time the industry notices, a whole community has already formed around it. Clark Mantilla is one of those figures. Born and raised in the Philippines, Mantilla moved to New York City in 2021 to pursue a musical theater education, a path largely unavailable in his home city. Today, as a working New York performer, teaching artist, content creator, and emerging voice in theater education, he has built a remarkably accessible gateway into musical theater performance for others around the world.
Most people first encounter Mantilla through a screen. His YouTube channels, Clark On Stage and Clark In Studio, together reach a global audience of nearly one million subscribers and have accumulated well over 245 million views. Those numbers are impressive on their own, but what makes them particularly significant is what they represent: hundreds of millions of moments in which aspiring performers found a scene partner they could not otherwise access.
The core of Mantilla’s digital work is deceptively simple. In his “Sing With Me” format, he performs one role of a duet or scene on camera and leaves space for the viewer to sing and act the other role. The production quality is deliberately high. The acting choices are specific. For many viewers, it is their first experience of performing opposite someone who treats the material like a real scene rather than just a backing track.
What began as a personal outlet for singing musical theater has grown into a resource that now spans Broadway scores, animated films, television soundtracks, and pop music duets. During the pandemic, when performers around the world suddenly had no one to sing with at home, Clark On Stage became, for many, a go‑to rehearsal partner. That use has continued: performers now routinely use his videos to practice auditions, rehearse for productions, or even stand in when a partner loses their voice. One TikTok-tagged story involved an actor using Mantilla’s video in performance when their castmate could not go on.
And Mantilla is not just a digital creator. Since graduating from the New York Film Academy and laying roots in the city, he has steadily built an expanding list of live credits. This includes multiple concerts at 54 Below, the Tony Award–winning venue that has become one of the most prestigious cabaret rooms in the world. He has appeared alongside Broadway artists, performed at Lincoln Center–adjacent events, acted in Off-Broadway productions that develop new musicals such as Holy Rollers, and contributed to new works in development. He has navigated the New York theater landscape as an actor, stage manager, understudy, and collaborator.
Now, with invitations to the Virginia Thespians Festival in both 2025 and 2026, Mantilla has stepped more formally into the role of teaching artist. His live “Sing With Clark On Stage” sessions and his participation as an expert panelist at the Festival’s Industry and Entertainment Job Expo have brought the methodology he developed on camera into classrooms and conference rooms. His work is beginning to influence how a growing number of young performers think about building a path in the arts.
We sat down with Clark Mantilla for an in-depth conversation about his journey, his philosophy, and what he believes the future of theater training looks like in a world where the digital and the physical are permanently intertwined.
Clark, let’s start at the beginning. When you launched Clark On Stage, did you have any sense that you were building something that would eventually reach nearly a million subscribers across two channels?
Clark Mantilla: Honestly, no. The initial impulse was very simple: I love musical theater, and I wanted a place online where I could sing that repertoire. I already had a main channel, but I wanted a space focused specifically on musical theater, so I created Clark On Stage for that niche.
The “sing with me” format didn’t start as a grand plan or a teaching method. I just wanted to sing musical theater duets, so I started recording myself on one part and leaving the other part open. Over a few months, those duet videos started getting more and more traction, and I realized that people weren’t just watching, they were actually using them.
When the channel began to grow in ways I hadn’t anticipated, I had to ask why. I think it was because there was a genuine gap: there weren’t many places online where you could get a high‑quality, performance‑level duet partner who stayed in character and supported your acting choices. It wasn’t just karaoke. It was a scene. People recognized that, and they stayed.
Describe the “Sing With Me” format for readers discovering your work for the first time. What makes it different from standard karaoke?
Clark Mantilla: With traditional karaoke, you’re usually alone with an instrumental track. In musical theater, that misses half the point, because so much of the work is in the relationship, the listening, the responding, the intention between characters.
In my videos, I’m on screen as your scene partner. I’m acting the other role with real commitment, I’m making specific choices, and I’m leaving space for you. You’re not singing into a void; you’re in a conversation. You have someone to look at, react to, disagree with, fall in love with, whatever the scene demands.
Practically speaking, what I’m providing is a rehearsal partner who’s available 24/7, anywhere in the world, and who will give you consistent energy and professionalism every single time. For performers who don’t have regular access to classes, coaches, or scene partners, that can be the difference between only ever singing along to a track and actually practicing the craft of acting through song.
You mentioned that the channel’s role shifted during the pandemic. When did you realize it had become more than just a performance outlet?
Clark Mantilla: The shift really crystallized during the lockdowns. Suddenly, everyone was isolated. No rehearsals, no in‑person lessons, no casting calls. I started getting messages from people saying, “You’re the only duet partner I have right now,” or, “Your videos are how I’m staying sane.”
After that, I began seeing more stories of how the videos were being used. People were preparing for auditions, rehearsing for shows, and in at least one case, using one of my tracks in performance because their duet partner had lost their voice. Someone tagged me in that on TikTok. That’s when it stopped feeling like just a fun musical theater channel and started feeling like a legitimate resource, a kind of digital rehearsal studio. I still approach it as a performer, but I’m much more conscious now of its utility for other performers.
Clark On Stage has over 540,000 subscribers, and Clark In Studio has over 371,000. How do you think about the relationship between those channels?
Clark Mantilla: The channels are built on the same core idea, “sing with me” duets, but they focus on different repertoires and audiences. Clark On Stage is dedicated primarily to musical theater and related material, Broadway shows, movie musicals, animated scores, and television musicals. That’s my home base and will probably always be my main channel. It’s where my own training and passion are most rooted.
As the channel grew, people started asking for pop duets: Taylor Swift, Ed Sheeran, and contemporary radio songs. I didn’t want to dilute the musical theater focus on Clark On Stage, so I created Clark In Studio as a separate space for that material. It allows me to respond to what viewers are asking for and to be more inclusive of people who don’t know the musical theater repertoire yet, but still want to sing with a partner.
The standards are the same on both channels, same production values, same commitment to acting and storytelling. They’re just serving slightly different communities.
I’m also planning a third channel, Clark Off Stage, which will be more behind‑the‑scenes: process, day‑in‑the‑life content, how I prepare, how the videos get made, and the real‑world logistics of being a working artist. That’s not live yet, but it’s on the horizon.
Let’s shift to your live performance work. You’ve performed at 54 Below more than a dozen times. What does that venue represent for you?
Clark Mantilla: 54 Below is a very specific kind of room. The audience there knows musical theater deeply; they understand the material, the writers, and the history. You feel that the second you walk onstage. It’s not a place where you can hide behind charm. The room expects you to bring something real.
Performing there consistently has been one of the most demanding and rewarding parts of my career. Each appearance forces me to grow, vocally, dramatically, and in terms of presence. I don’t think I would have developed in the same way if I had only ever performed for a camera. There’s nothing like feeling the audience breathe with you on a tricky bridge or react in real time to a storytelling choice.
One of my performances there ended up on 54 Below’s own TikTok account and crossed a million views, which was another moment where the live and digital worlds intersected in a very tangible way.
That viral 54 Below clip is a good example of how your live and online work feed each other. How do you see that relationship?
Clark Mantilla: For me, they’re not separate careers; they’re two sides of the same practice. When the 54 Below clip went viral, it brought a lot of new eyes to the cabaret world; people who might never have considered going to a venue like that suddenly saw how electric the atmosphere could be. At the same time, many of those viewers traced the clip back to my channels and discovered the duet videos.
So the live work validates the digital work; people see that I’m out there in New York, actually doing the thing, and the digital work continually brings new audiences to the live shows. I’ve had people come up after a concert and say, “I learned my audition song with you online and now I’m here seeing you in person.” That loop is really special.
Beyond 54 Below, you’ve performed at The Green Room 42, Don’t Tell Mama, Lincoln Center–adjacent events, and in Off-Broadway productions that develop new musicals, including Holy Rollers. How do you think about the arc of that life career?
Clark Mantilla: I think of it as a commitment to showing up in a lot of different kinds of rooms. The Green Room 42 has its own vibe. Don’t Tell Mama has a history and an intimacy that’s totally unique. Off-Broadway work on new pieces like Holy Rollers demands a different kind of rigor; it’s more about creating something from the ground up than interpreting an established standard.
Each setting teaches you something the others can’t. I’ve tried very consciously not to silo myself. I don’t want to be a performer who can only function in one environment, whether that’s cabaret, traditional theater, or online.
You’ve also worked behind the scenes and as an understudy, in addition to performing as a principal. How has that breadth of experience shaped you?
Clark Mantilla: Immensely. Stage management, understudying, production work—they all give you a view of the machine that most performers never see. As a stage manager or someone working backstage, you see the logistics, the communication networks, the chain reaction when one person is unprepared. It makes you, as a performer, much more considerate of everyone else’s time and responsibility.
Understudying is its own education. You have to know your track, the other actor’s track, and how your choices affect the whole ecosystem of the show. You might go on with very little notice. That level of readiness changes how you approach the material. It builds a kind of total understanding of the piece that you don’t always develop when you’re only ever playing one role from day one.
Let’s talk about the Virginia Thespians Festival. You were invited in 2025 and again for 2026. What did those invitations mean to you?
Clark Mantilla: It was a clear sign that the education world was paying attention, not just individual students who happened to find my videos. The Virginia Thespians Festival is a serious gathering of students who are actively considering careers in the arts. Being asked to come in as a teaching artist and clinician meant that what I was doing online had been recognized as something with pedagogical value, not just entertainment value.
In 2025, I led live “Sing With Clark On Stage” sessions, and the response from students and educators was strong enough that they invited me back for 2026 with an expanded presence. That kind of continuity is encouraging because it suggests the work is actually useful on the ground.
What do the live “Sing With Clark On Stage” sessions look like in that setting?
Clark Mantilla: The core idea is the same as online: I’m your scene partner. But live, it becomes much more immediate and interactive. Students come up and sing the other role opposite me, just like they would on YouTube, but in the room, I can respond to what they’re doing in real time. I can see the physical choices, the emotional life, the way they’re breathing and listening. I can ask them to try a different intention, or to ground a moment physically, or to adjust how they’re thinking about a lyric.
There’s often a visible shift when a student realizes, “Oh, this is a real scene partner situation, not just me showing my voice.” Their acting choices deepen, and their nerves settle a bit because they’re in conversation rather than performing “at” people. That’s what I aim for in every session: unlocking that understanding that singing in musical theater is acting.
In 2026, you’re scheduled to lead four “Sing With Clark On Stage Live” sessions at the Festival, double the number from 2025. What does that expansion signal to you?
Clark Mantilla: It suggests that the model is resonating. When a festival brings you back and expands your footprint, it means they see a real impact on the students.
For me, the most important feedback isn’t just from the organizers; it’s from the students who say things like, “I’ve been singing with you on YouTube for years, and this is the first time I’ve done it in person,” or, “I understand my audition song differently now.” If they leave feeling more capable, more curious, and more equipped to work, then the sessions are doing their job.
You also served as an expert panelist at the Festival’s Industry and Entertainment Job Expo. The 2025 theme was “Deep Roots: Bright Future,” focusing on legacy and the next generation. What did you share with students in that context?
Clark Mantilla: The Expo was about showing students how wide the entertainment industry really is, and how many different paths there are. Within that theme of “Deep Roots: Bright Future,” my role was to talk about using social media as a stage—how digital platforms can be part of your artistic life, not just a place to chase views.
I spoke about how I started as a musical theater artist, how I built my channels step by step, and how I navigated my own path instead of waiting for one predefined door to open. We talked very concretely about things like consistency, artistic integrity online, protecting your mental health, and how to build something that reflects your values rather than just algorithms.
The message I wanted to leave them with was that their legacy isn’t something that appears all at once; it’s built through small, repeated choices. The work you do when no one is watching—developing your skills, finishing that video, learning that song—is the work that eventually makes people watch.
Your career now spans digital content, live cabaret, Off-Broadway work, production roles, and education. Is there a through line that connects it all for you?
Clark Mantilla: The word I keep coming back to is access. Everything I build is, in some way, about making professional-level engagement with musical theater more accessible, regardless of where you live, what resources you have, or who you already know. The channels give people a free, always‑available scene partner. The live performances show that you can bring that same level of commitment from the screen to the stage. The education work is about handing tools directly to the next generation so they can carve their own paths.
If someone in a small town or in another country can prepare for an audition, explore a role, or simply feel like a “real” performer because they had access to these resources, then the work is doing what it’s meant to do.
Finally, where do you see this work going next?
Clark Mantilla: I see the educational side growing, more festivals, more workshops, more institutional partnerships where the “Sing With Me” concept can be used intentionally as a training tool, not just something students find on their own.
Digitally, nearly a million subscribers and over 245 million views feel less like a finish line and more like a foundation to build on. I want to keep pushing the quality of the content, expanding the repertoire, and challenging both myself and the viewers artistically.
And I want to keep working live in New York and beyond, in cabarets, in new musicals, in any room where people care deeply about this art form. At this point, I don’t separate the digital, the live, and the educational. They inform each other constantly, and that intersection is where I’m most interested in living as an artist.
Clark Mantilla performs regularly at 54 Below and other New York venues. His channels, Clark On Stage and Clark In Studio, are available on YouTube. He can be found on TikTok and Instagram at @clarkonstage, and his Patreon community offers additional exclusive content for subscribers. For more information about his live sessions and upcoming performances, visit his channels directly.
YouTube
Clark On Stage, 540K Subs https://www.youtube.com/@clarkonstage
Clark In Studio, 371K Subs https://www.youtube.com/@clarkinstudio
TikTok
@clarkonstage, 53K, www.tiktok.com/@clarkonstage