The musicians recorded ten takes, the last of which was selected for overdubbing. To create what Spector biographer Mark Ribowsky terms a "four-man Wall of Sound" production, Lennon added grand piano onto the basic track, while Harrison and White shared another piano and Voormann played electric piano. In addition, Beatles aide Mal Evans overdubbed chimes (or tubular bells) and White added a second, muffled drum part. Rather than an instrumental solo over the third verse, Lennon vocalised a series of what Urish and Bielen term "grunts and moans". Lennon felt that the chorus was missing something, and so Preston and Evans were sent to a nearby nightclub to bring in a group of people to provide backing vocals. These newcomers and all the musicians, along with Allen Klein, then added chorus vocals, with Harrison directing the singing.