No particular order:
Physical Graffiti ~ Led Zeppelin
Songs in the Key of Life ~ Stevie Wonder
Chicago II ~ Chicago
Eat a Peach ~ The Allman Brothers
The Wall ~ Pink Floyd
Honorable mentions:
Tommy ~ The Who
Trout Mask Replica ~ Captain Beefheart
Bitches Brew ~ Miles Davis
Physical Graffiti ~ Led Zeppelin
Songs in the Key of Life ~ Stevie Wonder
Chicago II ~ Chicago
Eat a Peach ~ The Allman Brothers
The Wall ~ Pink Floyd
Honorable mentions:
Tommy ~ The Who
Trout Mask Replica ~ Captain Beefheart
Bitches Brew ~ Miles Davis