Everybody (or their big sister) had a copy of Cat Stevens Greatest Hits back in the day, and it was a darned good collection in a heartfelt folkie-poppy sort of way. But if you really wanted to know the depth of the Cat, you had to go to track one, side two of the album Catch Bull At Four, the song called 18^th Avenue (Kansas City Nightmare) which managed in its less than four and a half minutes to cover all manner of mood and intensity, all of it cloaked in doom and shadow and, despite the obliqueness of its lyrics, definitely going somewhere.