Builder project · iteration 2

Play along: be the fourth sax

Three AI-directed saxophones play a Bach chorale. You play the missing part. Pick your saxophone, press play, and follow the box. Slow it down to learn your part: the music and the score slow down together. 🎧 Headphones on.

Tip: tap the score to jump there. Nothing you do on this page is sent anywhere.

Written pitch for your saxophone (soprano and tenor in B-flat, alto and baritone in E-flat). Note names are shown on your part.

🎧 Headphones on. Five recordings, all in 3D: Just listen puts you in the middle of the quartet, which sits in a ring around you. Pick your saxophone and you move into that player's empty chair: you hear the other three from where they really sit, and you play the missing part.

Honest note: this isn't a world-class recording, and it isn't trying to fool anyone - the players are software saxophones, and our score is a simple one we drew ourselves. It's here to show what young builders can dream up, build and share with the world in under an hour. This second version took less than 20 minutes.

Music: J. S. Bach, chorale BWV 66.6 (public domain). Conceived and directed by Don Wood, built with an AI agent. How we built it · Learn to build