50 Classic Albums Celebrating Their 40th Anniversary in 2012

Nineteen hundred and seventy-two is one of those rare years -- like, say, 1967, 1969, 1971 and 1991 -- that saw the release of several seminal rock albums. As we wrote last year in our 1971 story, "even for a year that falls squarely in the heart of the 'classic rock' era, it was a particularly classic year."