 While working alone at Trident Studios, down the hall from where the band were recording, Lomax was invited to 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.