'Let's Go Crazy,' a star-studded 'Grammy Salute to Prince,' was full of memorable moments when it aired Tuesday night on CBS. Also today: Derek Jones (Falling in Reverse) has died; there's a growing market for loops and samples (but don't try to steal Pitbull's trademarked yell); Vans is releasing special shoes to support the music world; and Bandcamp plans to waive fees yet again.