5. The Beatles, 'The White Album' (1968)
The Beatles responded to political turbulence in the world as the band's spiral towards their break-up began. Their self-titled double-album, known best as The White Album, was written primarily in India and saw the group become more bitter and satirical in their music. Though Martin's own relationship with the group was growing tense, he is still behind many of the instrumental arrangements and even contributed vocals to the sound collage "Revolution 9."