I think The Beatles album "Revolver" is one of the best albums ever made, and is the predecessor of Sgt. Pepper's Lonely Hearts Club Band, which is widely known as the greatest album of all time.
Also, Rubber Soul is another honorable mention from the Beatles. My other favorite Beatles albums are Please Please Me, A Hard Day's Night, Help!, Magical Mystery Tour, and Abbey Road.
Other Personal faves:
Rumours- Fleetwood Mac
Saturday Night Fever Soundtrack
Rhythm Nation- Janet Jackson
Janet- Janet Jackson
Spice- The Spice Girls
Spiceworld- The Spice Girls (I regret nothing!!!!!!)
Stripped- Christina Aguilera
The Fame + The Fame Monster- Lady Gaga
Teenage Dream- Katy Perry
Born This Way- Lady Gaga
Femme Fatale- Britney Spears
Lotus- Christina Aguilera
Take Me Home- One Direction
Sorry there's a lot
: