Play with a MIDI keyboard, tap the keys, or use your computer keyboard: A S D F G H J K are white keys, W E T Y U are black keys, Z and X shift the octave (now starting at C4), Space plays and pauses. Add your own songs with Add song or by dropping files on the page: MIDI (.mid) or MusicXML (.musicxml, .mxl). Free public domain pieces are on Mutopia and MuseScore. Got a PDF or photo of sheet music? Open it in the free MuseScore app (File, Import PDF), then export MusicXML and add that. Songs you add are saved in this browser only. On an acoustic or digital piano with no cable, tap Use microphone and Keystave listens for the notes instead. Headphones help, so the app's own sounds don't get picked up. In Wait for me, the music stops on each note until you hit it. Pick one hand and the other plays itself. Drag the sheet to move around.