1970s Paul McCartney and Wings Tapes Up for Auction - with Audio Samples

Watch: 'A History of the Beatles' Recording Techniques' with Engineer Ken Scott

The road to the "White Album": Pictures from the "Lady Madonna" sessions

Vintage Beatles pic: John

Video: The unpredictable sound of Sgt. Pepper's Lonely Hearts Club Band - Sound of Song: Episode 2 - BBC

Book review: "The Beatles Through Headphones - The Quirks, Peccadilloes, Nuances and Sonic Delights of the Greatest Popular Music Ever Recorded"