A lot of albums of The Beatles are considered as their peak, and was acclaimed for the critics. The Sargent Peppers, Revolver or The White Album are examples of this. They are usually considered in the "Best albums ever" polls, but the critics are harsh on the album Rubber Soul, recorded in 1966. It had been less acclaimed than the quoted albums, but his importance are equally notable: It was the first album of the rock era that sounded like an album, with the astringent guitar of George, a heavily compressed piano and a thread of black humor.
The comedy and the irony are included in several songs of Rubber Soul, specially about other countries in the region. The Beatles tried to assimilate the continental countries sounds, on a very exotic form. Examples of this are the songs Michelle ( A french pastiche), Girl (A Weimar-esque song), and Norwegian Wood (a parody of the Scandinavian).Also The lyric in this song are the firs on included content about sex (although very camouflaged, like Drive My Car), and contents of true darkness (like girl, Run For Your Life or In My Life).
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The link:
http://www.theguardian.com/music/2015/dec/03/the-beatles-rubber-soul-50-still-ahead-of-its-time