One of the most popular, and analyzed, albums ever is undoubtedly 's 1979 sprawling masterpiece . Although the definitive version remains the aforementioned studio album, there has also been a 1982 movie (starring a pre- ), and two separate live albums -- one by in 1990 ( ) and the other a delayed release of performances from the early '80s (2000s ). So you think that would be the last we heard from , right? Think again. A multitude of classic rockers/prog rockers have united to cover in its entirety, under the title . Led by producer , a rotating case of musicians was assembled to make anyone with a well-worn copy of drool with excitement -- ' , , and ; 's , among countless others. Interestingly though, it can be argued that was 's least "progressive" album, as the group focused on tight song structures -- obviously inspired by the then burgeoning and movements. The performances are expectedly spot-on (and it's quite impressive how they re-created all the sound effects/ bits so precisely), and stick very close to the originals -- except for a -led take of which adds a few extra bits. With an ever-increasing overabundance of versions of to choose from, you've got to wonder if was necessary at all. ~ Greg Prato