Imagine a service that anonymises youtube / last.fm or any other online music player, so one cannot see what is played. You can post a link to this anonymised song to twitter and the first of your follower who guesses it right gets "a point" :-)
What you think about this?
How can we anonymise youtube or last.fm without harming copyright?
It seems to be very easy just with the Youtube API's:
here is how to turn of video informations:
and here is how to get videos:
now we only need to scramble to original video or dont display it, but play the sound