ABBA

Few moments in pop pack the punch to the head that comes during the first chorus of "S.O.S." (And Abba's kind enough to do it three more times before the song ends.) Don't stop at some hits collection or you'll miss hearing those voices taking "On Top of Old Smokey" to trippy heights, a song called, uh, "Bang A Boomerang," and the hard rock candy of "Hey, Hey Helen."