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Strawberry Fields Forever - The Beatles
This is from the Love album, produced by George Martin and Giles Martin. This mix uses a Lennon demo as its basic premise and grabs elements from a bunch of other Beatles songs — an orchestral section from Sgt. Pepper’s Lonely Hearts Club Band, a solo piano from In My Life, brass from Penny Lane, cello and harpsicord from Piggies and the coda from Hello, Goodbye.
The result is complete awesomeness.