Under the moniker of "The Plastic U.F.Ono Band", Lennon engaged the services of session drummer Jim Keltner, guitarist David Spinozza, Gordon Edwards on bass, Arthur Jenkins on percussion, Michael Brecker on saxophone, Ken Ascher on piano and organ, and the vocal backing of a group called Something Different. Difficulties between Lennon and Ono became more and more noticeable around this time. Just as the sessions were to get under way in June at New York's Record Plant Studios, John and Yoko separated. At Ono's urging, Pang became Lennon's companion and lover in what would become an 18-month relationship later renowned as Lennon's "lost weekend".