6. Jethro Tull – Thick as a Brick (1972)
Thick as a Brick is the fifth studio album by Jethro Tull and includes one song that spans the entire album. The album was intended as a spoof of other Prog concept albums by Yes, ELP and others. It came at the peak of the band’s success and help set the standard for the prog concept album.
5. Queensryche – Operation:Mindcrime (1998)
Operation: Mindcrime is the third studio album by Queensrÿche, released on May 3, 1988. This rock opera, is the story of a recovering drug addict who becomes disillusioned with the corrupt society of his time and reluctantly becomes involved with a revolutionary group as an assassin of political leaders. It is considered their best album still.
4. Spock’s Beard – Snow
Snow is the sixth studio album for Spock’s Beard, and the final album with main songwriter and vocalist Neal Morse, who left immediately after the release of the album. The band never toured with it, although they did bring together all the members throughout the history of the band years later for two performances of the entire album, one in Nashville at Morsefest and one in Germany.