Chrome Music Lab
To make a song, add notes by clicking the grid. Then, share your song with a link. You can also use a MIDI keyboard or sing a note into your mic.You can also use your computer keys. Press the arrow keys to move, enter and backspace to add and remove notes, and spacebar to play.
Drawing music.
The site is very similar to the one described above.
The site is very similar to the one described above.