Try Chime Lab free in your browser, with nothing to install and no account. Drop balls into a ring of pegs and let them play. Every peg is a note, and the whole ring stays in the key and scale you pick, so whatever bounces out sounds like music. Spin the ring, stand pegs anywhere, give each ball its own sound, snap the notes to a beat, then record a take and keep it as a sound file or as MIDI.