[4][5][2] The song features several changes in tempo, a sped-up double-tracked vocal part by Barrett, while drummer Nick Mason simultaneously sings the normal part[5][6] (one of only 4 moments he ever sang on a Floyd record),[7] a range of bells,[8] crowd noises,[8] an instrumental section that continually increases in speed featuring wah-wah guitar solos and keyboards, and surreal lyrics.
[5] The two tracks were arranged to be released as a single on 8 September 1967, before it was vetoed by the band's record company, EMI.
"'Scream Thy Last Scream' has lead vocals by Nick Mason," noted David Gilmour in 2002.
"[11] A late-Barrett era rendition was recorded live in Rotterdam in November 1967, at the Hippy-Happy Fair.
[12] Producer Malcolm Jones (who produced Barrett's The Madcap Laughs album) remixed "Vegetable Man" and "Scream Thy Last Scream",[13] for inclusion on the Barrett rarities album Opel (1988).