Like when someone checks your profile to write on your wall or w/e, a song of your choice (that you bought from itunes or w/e) plays in the background. I think more ppl would get ATRL+ tbh!
Its a good idea but personally I found it annoying when I used to be on Tumblr and visit someones blog and some Lana Del Rey song would start blasting over top my iTunes
**** that. Maybe if there was a Youtube video widget on your profile which didn't automatically play the song then yeah, that'd be fine. Not here for MySpace/Tumblr level annoyance of opening a profile and being forcibly blasted with Katy Perry or whatever trash a user stans for.