Crowdsound is an interesting little experiment in Online Music Collaboration which they describe as “an experiment in crowd-sourced songwriting”. The basic idea behind this site is that a song is being created note by note based on a simple system where you listen to the song as far as it has been made so far, then decide on which note you think is the best choice to come next. you then submit your vote and the most popular choice is selected. there is a simple piano roll view on the page where you can view the track in progress and also change sounds or tempo too. So go ahead and write a song with a crowd!