While Abbey Road Studios still only used four-track at the time, Trident's Ampex eight-track machine drew the Beatles on 31 July 1968 to record their song "Hey Jude". Paul McCartney later said about recording the track at Trident: "Words cannot describe the pleasure of listening back to the final mix of 'Hey Jude' on four giant Tannoy speakers which dwarfed everything else in the room ..." The band also recorded some songs for their 1968 double album The Beatles (also known as the White Album) at Trident – "Dear Prudence", "Honey Pie", "Savoy Truffle" and "Martha My Dear" – and on February 22, 1969, they first recorded "I Want You (She's So Heavy)" there for the album Abbey Road. John Lennon and Yoko Ono later returned with the Plastic Ono Band to record "Cold Turkey" featuring Eric Clapton on lead guitar.
