Curious where that familiar bit of a Black Eyed Peas song was nicked from? Want to see which old school artists are most often sampled? Want to know just how unoriginal Jay-Z and Kanye really are? Whosampled.com is the most comprehensive database of sampled and covered songs that we know of. An invaluable resource for those who care about the DNA of pop music.
http://www.whosampled.com/
Every Moment Has A Song 