Your left hand chooses
Show 1–5 fingers to choose one of the first five chords. Use index + pinky for chord 6, add your thumb for chord 7, or make a fist for silence.
A browser instrument powered by movement
Play music
with your hands.
Use your left hand to choose what you play. Use your right hand to shape how it sounds. Then sing, record and share the result.
No instrument or music theory required. Camera access starts only when you enable it.
LIVE INSTRUMENTREADY
LEFT HANDAm3 fingers · active
RIGHT HAND78%volume · bright
Your voice is optional Record the performance
Two hands. Two simple jobs.
You do not need to understand music theory before you play.
Your right hand shapes it
Move higher for louder and lower for quieter. Tilt for a brighter or softer tone. Show 1–4 fingers to move from simple to richer chords.
Try 1 → 4 → 5 → 1
Keep one right-hand finger raised. Change your left hand slowly through 1, 4, 5 and back to 1, then hum or sing anything over it.
Think of the numbers as buttons, not music theory.
“1” is a comfortable starting sound. “4” opens the music up. “5” adds a little tension. Returning to “1” feels like coming home.
See the beginner guideFour ways to play
Start with the sound you want.
Gesture Chords
Choose harmony with your left hand. Shape volume and tone with your right.
Open modeOnline Theremin
Move through the air to control continuous pitch and volume.
Open modeMelody
Turn movement into individual notes for simple melodic experiments.
Open modeKeyboard Mode
Keep playing when a camera is unavailable or you prefer keys.
Open modeWant a starting point?
Follow a song. Keep your freedom.
Guided Songs show lyrics, sections and optional chord references. Your hands still make the music.
Browse Guided Songs