place during a period when, free of deadlines following the completion of their album Sgt. Pepper's Lonely Hearts Club Band in April 1967, the Beatles worked on songs for the United Artists animated film Yellow Submarine and for what became the band's television film Magical Mystery Tour. They recorded "Baby, You're a Rich Man" in a six-hour session, starting at 9 pm on 11 May, at Olympic Sound Studios in Barnes, south-west London. The session marked a rare example of the Beatles recording outside of EMI's facility at Abbey Road, after the band had briefly used Regent Sound in central London during the sessions for Sgt. Pepper. The engineers assisting George Martin, the Beatles' producer, were Olympic manager Keith Grant and Eddie Kramer. Mick Jagger, whose band the Rolling Stones regularly used the same studio, also attended the session. The song was mixed, in mono only, that same day. The music features an unusual oboe-like sound reminiscent of an Indian shehnai, which was created with a clavioline, an early, three-octave forerunner of the synthesizer. Being a monophonic keyboard, it was capable of sounding only one note at a time; according to music journalist Gordon Reid, citing a report from the session, Lennon created the trill sound "by rolling an orange up and down the keyboard" of the clavioline. Musicologist William Echard cites the clavioline part as an example of a psychedelic feature he calls a "garble line" – a musical part that "often meanders widely through pitch space, following a rhythmic profile that does not adhere strongly to the prevailing harmonic or melodic logic" – with "Orientalist connotations". A feed back delay effect known as spin-echo was used to fill from the end of one line of the verse to the start of the next. After Lennon had played piano on the basic track, McCartney overdubbed a second part, which enters at 1:45 and is heard in reverse over the third verse. In its doubling of the vocal line, Harrison's lead guitar mirrors the role of a sarangi in an Indian khyal vocal piece, an effect that Harrison first used on Lennon's song "Lucy in the Sky with Diamonds". Following the completion of Sgt. Pepper in late April 1967, the Beatles' recording sessions for the remainder of that year have been dismissed as uninspired by the majority of commentators. Kramer contests this view, however; he says of the Beatles' collaboration