Is This What You Want? add backing vocals to "Dear Prudence" in late August; he had also joined the backing chorus for "Hey Jude" earlier that month. The songs recorded included "Sour Milk Sea" and "The Eagle Laughs at You", for the A- and B-side of Lomax's debut single on Apple, and "You've Got Me Thinking". Among the guest musicians on the London sessions, much of which would go unused, were Eric Clapton, Ringo Starr, Nicky Hopkins, Klaus Voormann and Paul McCartney. Other participants included drummers Bishop O'Brien and Pete Clark; the former was part of Apple artist James Taylor's backing group, while Clark was
This Is What You Came For it and cut the vocals", and also confirming her previous request for secrecy as co-songwriter. The credit has since been officially changed to "Taylor Swift" in BMI's and ASCAP's entry for the song. "This Is What You Came For" is an EDM song. Gil Kaufman of "Billboard" stated that the song is "a chilled-out, joyful club track that nods to classic Chicago house from the late 1980s and early 1990s, but with a modern, poppier flavor." The song is written in the key of A minor with a tempo of 124 beats per minute. The song follows a chord progression