Move your mouse over the lines to play notes. Click a line to change its pitch, delete it, etc. Click the button with the music note to place a new note. Clear the default notes by clicking the garbage button. The - and + buttons on the side change the pitch of all of the notes. The black button with an arrow is "undo". The zoom buttons make it easier to perform more or less specific actions.
Click the Export button to get a code for your music (the code is cloud variable compatible!). Share the code in the comments! Click Import to paste in other people's codes. A few interesting note groups I made (that you can import): 2050002060067074081088095 2050003060070074079 http://scratch.mit.edu/discuss/topic/57700/ Currently version 0.5 (October 14, 2014). - Export codes now include instrument used for note groups. Old codes are still compatible (old codes start with 2).