Best band never to release a truly great album?


Yeah, I know, another poll, but these are kind of fun and this one may be a little different. Let's limit it to no earlier than the late 60's (when the album began to be more important than the single). What musician/band do you really like, but has never quite put it all together to make that brilliant album you know is in them.

I'll start by nominating Jethro Tull. Lot's of great songs, but I cannot think of a single Tull record I would call an unqualified success.
curbach
Trey, I'm afraid you're gonna have to make your case why, if you don't consider Now!, Out of Our Heads, December's Children, Beggar's Banquet, Let it Bleed, or Sticky Fingers (and possibly even 12 X 5, Aftermath, Exile on Main Street, or Some Girls) to be great albums.
Curbach , this is a great thread, but I have to disagree with the Tull comment. Songs from the wood is a very good record and Crest of a Knave is great. Trey, I have to agree with Zman, the stones have several great albums, Beggar's Banquet is an excellent album.
Vegasears, with the exception of Dixie Chicken (which I think is one of the best made by anyone) you're right about Little Feat -- they came reasonably close with Time Loves a Hero. Absolutely agree with Roy Buchanan. Government Mule never had a great one (that I heard) but had/have lots of talent. John Mayall too -- great talent, compiled great talent, but never had a killer album. I'd love to hear everyone's opinion on whether Clapton really had a killer album post-Layla. He had a bunch of great songs and gives a great concert, but I can't recall a great album on his own. If you want to get really, really picky, Sound Garden had a couple of great albums but they each had some pretty weak tracks (IMO). Excellent question.
This would be indicative of why Roy Buchanan, whatever anyone may think about him as a guitar player, was not actually one of the "greats" as an artist....