Mike Oldfield

Mike Oldield is phantastic. i love his whole discography, esp. 'Voyager', 'Amarok' and 'Tubular Bells II'
 
Oldfield is a prolific musician. Some good, some not so good, and a few great records. If you like TB 1, check out Ommadawn, Incantations, the aforementioned Amarok, and Songs of Distant Earth. Oldfield did some more pop oriented work in the 80's but most of his albums from that era feature a longer progressive track. The best of these is Crises, whose title track is great and the album also features a guest appearance by Jon Anderson of Yes fame.