This should be number 1 - the entire album essentially flows together one song, without sounding like the same song over and over. It's also the second best selling album of all time (the best selling one of the seventies, so I think it wins).
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Top 10 Albums of the 70s
#2
Suggested by
jeremymathews18
David Bowie-The Rise and Fall of Ziggy Stardust and the Spiders From Mars