Music

My compositions

Piano music, with sheet music and MIDIs
Other music

Synthesizers

Synthesizer/piano keyboard (requires JavaScript and web audio)
Undertone keyboard: A different way of constructing a musical scale, not based on our 12-note chromatic scale (requires audio support)
Integer xylophone: another way (requires JavaScript and web audio)

See also

Frequency conversion, which includes an option to generate waves at a particular frequency or simple metronome-ish clicks (check "Audio"), and to click each beat of a piece of music to find the tempo