Released originally as an EP in England; in the US Capitol tacked on a bunch of phenomenal songs from singles; those songs alone (Strawberry Fields, Penny Lane, All You Need is Love, Baby You're a Rich Man, Hello Goodbye and I am the Walrus*) would be a legendary album for any other artist. Tack on a few more songs and you've got another Beatles classic. Not ones to rest on their laurels, the Beatles had just finished recording the songs for Sgt. Pepper and within a couple of weeks continued recording several of the songs that went on to populate this Album.
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* I am the Walrus was the B-side of the single, Hello Goodbye but also was on the British Magical Mystery Tour EP.