Instruct: Classify a given review as either positive or negative.
Query: A Unique Album

There are not many bands that could put out an album length song and get away with it. I know Tull came under immense pressure for Thick as a Brick, but the final result is one of the best Tull albums recorded. Thick as a Brick is a very upbeat song/album and with mulitple time changes and master musicianship, the album never gets dull, or boring. If you have only heard the chopped up versions available on best of CD's then you have to do yourself a favor and buy this album to hear Thick as a Brick in it's complete form. One of the best things about Jethro Tull, is that they constantly push and try new things, whether it's album length tunes like Thick as a Brick or Passion Play, of whether it's trying out new sounds like 80's Tull with Under Wraps. Thick as a Brick is a must have for any rock fan.