In June 1973, Emerson, Lake & Palmer began recording "Brain Salad Surgery" in London at Advision and Olympic Studios which lasted until September that year. Offord was not present for the recording sessions as he was working with Yes, leaving engineering and mixing duties to Chris Kimsey and Geoff Young. Lake wrote the album's lyrics with Peter Sinfield and its sleeve was designed by H. R. Giger and includes the band's new logo. Formed of five tracks, the album includes a rendition of "Jerusalem" which features the debut of the Moog Apollo, a prototype polyphonic synthesizer. "Toccata" is a cover of the fourth movement of Piano Concerto No. 1 by Argentine composer Alberto Ginastera and contains synthesised percussion in the form of an acoustic drum kit fitted with pick-ups that triggered electronic sounds. The 29-minute track "Karn Evil 9" is the longest song recorded by the group. "Brain Salad Surgery" was released in November 1973 and reached No. 2 in the UK and No. 11 in the US.