Symphony Sketchpad: how a music creation traveled beyond Sekai

Symphony Sketchpad is a music creation made on Sekai that turns drawing into sound: you sketch lines on a canvas, and they play back as a melody. It took off far beyond the app. Videos of people playing it spread across YouTube, Instagram, and TikTok, and as of September 2026, its major social videos had more than 82 million views¹. It's a clear example of how something made on Sekai can reach a huge audience outside it.

Every so often, something made on Sekai catches on in a way nobody planned. Symphony Sketchpad is the biggest example yet. Here's what it is, why people couldn't stop sharing it, and how it ended up in front of tens of millions of viewers.

Draw a Line, Hear a Song

Symphony Sketchpad is a music toy you play by drawing. You drag your finger across a glowing dot-grid canvas, and every stroke becomes a note. Left to right is time; bottom to top is pitch. Hit play, and a white scanline sweeps across the canvas, triggering each stroke as it passes, with bursts of light where the notes land.

The trick that makes it work: the canvas is mapped to a pentatonic scale, so there are no wrong notes. Whatever you draw sounds musical. You don't need to read music or play an instrument. A quick dash gives you a short, crisp beat; a long, sweeping curve becomes a sustained melody.

Then you start layering. There are 21 instruments to paint with, from Deep Bass to Xylophone to Space Synth. Put the low ones near the bottom, the bright ones near the top, and a doodle turns into a full arrangement. There's even a tongue-in-cheek Upgrade Shop that lets you crank the volume to absurd levels.

Made for a Ten-Second Video

Symphony Sketchpad is just as fun to watch as it is to play, and that's what made it travel.

A video of it explains itself in seconds: someone draws a spiral, the scanline sweeps across, and a melody comes out. There's no setup to explain and no rules to learn. The loop is short, the visuals are bright, and because of the pentatonic scale, everyone's drawing sounds good, whether it's a careful composition or a scribble. Viewers watch one and immediately want to try their own.

From Sekai to Everywhere

Short videos of Symphony Sketchpad started showing up on YouTube, Instagram, and TikTok, and they took off. Some show a single satisfying drawing turning into a song; others are tutorials walking people through the instruments. Before long, people on TikTok were searching for how to get Symphony Sketchpad on Sekai.

Here are some of the most-watched videos:

Together, Symphony Sketchpad's major social videos passed 82 million views by September 2026¹. Sekai featured it as an App Store event under a line that summed it up: doodle, hear it, remix.

Made to Be Shared, Made to Be Remixed

Symphony Sketchpad is what Sekai looks like when an idea really lands. It's playable in seconds, it's fun to watch someone else play, and it's open for anyone to remix: people can take the idea and build their own version on Sekai.

That's the whole loop in one creation: make something, people play it, they share it, and someone builds the next thing on top of it.

Want to see what else people are making? Explore the Sekai community

Have an idea of your own? Start creating