Jethro Tull

Having written the Odyssey of Rock, they elevate themselves to the Homer of (prog) rock. That they might have their face on albums of drunken, slacker folk blues, gritty folk rock, a masterful hard rock album, some para-jazz escapades, a classical-folk trilogy, a few nice electronic albums, an anthology-worthy hard AOR comeback, an exploration of Eastern music, and a new folk epilogue places them, damn it, at the very top. Am I forgetting something? Oh yes, they brought the transverse flute into rock, played xdi+ by God!