"White Album"), and was given over entirely to songs written by Harrison. The line-up on the basic track was Harrison on lead guitar, Lennon on rhythm guitar, McCartney on tack piano, and Starr on drums. Four takes were needed to achieve a satisfactory performance. Beatles historian Mark Lewisohn comments on the band's tight ensemble playing, evident from the studio tapes, and how focused each musician sounds in his contribution. Clayson recognises the "undercurrent of bottleneck" in Harrison's main guitar riff as anticipating his slide guitar style, a technique he first embraced in December 1969 while on tour with Delaney & Bonnie and Friends. The unusual bass sound over the song's bridges was achieved by tracking the bass with the lead guitar, replicating the bass line that Harrison had played on his demo. Everett states that it was McCartney's Fender Jazz Bass doubled with Harrison's Telecaster, both playing chromatically moving arpeggiations in a similar manner to the bridge guitars in "And Your Bird Can Sing". In a 1987 interview for Creem magazine, however, Harrison recalled that he was the bass guitarist on the track, rather than McCartney. When the interviewer, J. Kordosh, suggested that the bass part "sounds like McCartney was going nuts again", Harrison replied: "That was me going nuts. I’m doing [on the bass] exactly what I do on the guitar." Harrison recorded his lead vocal in a corner of the studio, to capture a natural reverberation from the room. The backing vocals were sung by Lennon and McCartney. Also present during the vocal overdubs were the Aerovons, an American band who had based their sound and image on the Beatles, and had come to London to record at EMI. Tom Hartman, the Aerovons' singer and guitarist, recalled that the Beatles attempted the line "Who knows, baby, you may comfort me" countless times, trying to perfect their performance. According to author Elliot Huntley, after Lennon had made derogatory remarks about Harrison's songwriting in January, he now sounded "audibly excited" by "Old Brown Shoe" in his "enthusiastic and energetic backing vocals" on the song. The Beatles devoted the rest of the session to taping a basic track for "Something", although it was later discarded as the band chose to record a new version the following month. Harrison completed the "Old Brown Shoe" recording alone on 18 April. He first overdubbed a guitar solo that Everett describes as "stinging" and "highly