Look, there are only so many musical notes, chords and riffs that a person can string together into a song. So over the course of decades, there's bound to be a little, er, borrowing here and there. Long before sampling made lawsuits the lingua franca that bonded so many disparate musicians together, artists were suing other musicians for plagiarism and copyright infringement. Lawsuits against hip hop groups are countless, but here are 11 rock groups who've been taken to court for plagiarism, from Radiohead to Coldplay to Avril Lavigne.