Mercury enlisted May and Taylor on the tracks, which were released on a single under the name Larry Lurex, a parody of Gary Glitter. Recording The process of recording only during studio downtime—late evenings or overnight—lasted from April to November 1972. Roger Taylor recalled, "You could see the working girls at night through their laced curtains, so while we were mixing, we would have a little bit of diversion". The limitations of this arrangement led the band to focus on completing one track at a time, but problems arose almost immediately. The band had thought highly of their De Lane Lea demo tracks, but producer Roy Thomas Baker had them re-record the songs with better equipment. "Keep Yourself Alive" was the first song to be re-recorded, and Queen did not like the result. They recorded it again, but no mix met their standards. After seven or eight failed attempts, engineer Mike Stone stepped in, and his first try met with Queen's approval. Stone would stay on to engineer and eventually co-produce their next five albums. May later commented that "Between Roy [Thomas Baker] and I, we were fighting the whole time to find a place where we had the perfection but also the reality of performance and sound". Another track that proved problematic was "Mad the Swine", which was to be the fourth track on the album between "Great King Rat" and "My Fairy King". Baker and Queen disagreed over the drum sound and percussion, and it was left off the album. It re-surfaced in 1991, remixed by David Richards, as both the B-side to the "Headlong" CD single in the UK, and on the Hollywood Records re-release of the album. Other recordings from this period, such as two Smile tracks ("Silver Salmon" and "Polar Bear"), "Rock and Roll Medley" (a live encore staple from the era), and the infamous track "Hangman" (whose existence was long denied officially, beyond live concert recordings), have surfaced in the form of a studio acetate disc. Songs Overview The music on Queen has been described as hard rock, progressive rock and heavy metal. The album showcased the influence of contemporary rock bands such as Led Zeppelin, Black Sabbath and Jethro Tull, while the lyrics were reflective of "mystical sword 'n' sorcerers themes" with "medieval landscapes." Michael Gallucci of Ultimate Classic Rock noted how "mostly Queen is a product of its time, bringing together prog,