Jethro Tull - "Thick as a Brick" (Madison Square Garden, 1978)
http://www.youtube.com/watch?v=BV-ASc0qkrM
Of course the original TAAB is 44 minutes long, and it was Tull's follow up to the "Aqualung" album. The critics dubbed "Aqualing" as a concept album, which it was never intended to be according to the band members. Their response was TAAB, which Ian Anderson called "the mother of all concept albums". With the primary theme being a spoof of the recording industry, they were stating that the critics wouldn't really know a concept album if it hit them in the face. Many will remember the newspaper-style album jacket which came out with the vinyl release in 1972, and all of the great Monty Python style articles it contained:
Ian's vocal performance is stellar, and now that the passage of time has removed both his range and his growl, we won't see it like this again. There are lots of more recent performances, but I think this is the best live version of this Prog Rock classic, even though it's been "bite-sized" for performance purposes. Enjoy!