Jethro Tull are good too, but I would only suggest thick as a brick and maybe aqualung...Oh yeah, also 'In search of the lost chord' by the moody blues.
~ A Passion Play, imo, is better than any other album JT ever recorded. The hooks are plentiful, and the musicianship is first-rate. If you never heard this cd, you owe yourself to go out and buy it.
~ As for the Moody Blues, In Search of the Lost Chord has probably their most well known and best song, Legend of a Mind, however, they have numerous other great albums - 7th Sojourn, Days of Future Past, A Question of Balance, & On the Threshold of a Dream - are as good as ISotLC or even better.