Phenomenon is the third studio album by English hard rock band UFO, released in May 1974. It was the band's first album to feature lead guitarist Michael Schenker, who replaced Mick Bolton. Production Their third studio album in total, Phenomenon was UFO's debut with major label Chrysalis Records and also their first to be released in the United States. With the arrival of ex-Scorpions lead guitarist Michael Schenker, Phenomenon saw UFO begin to leave their blues-based "space rock" sound behind as the band began transitioning to a more straightforward hard rock sound. The album was produced by Leo Lyons, bass guitarist of British rock group Ten Years After. All tracks were recorded at Morgan Studios in London. The original cover design and photos were produced by Hipgnosis. Influence British heavy metal band Iron Maiden released a cover version of "Doctor Doctor" as the b-side of the "Lord of the Flies" single in 1995. They also included it in their Eddie's Archive boxed set collection of 2002. Track listing Personnel UFO Phil Mogg – vocals Andy Parker – drums Pete Way – bass Michael Schenker – guitar Additional personnel Bernie Marsden – guitar on tracks 11 and 12 Production Leo Lyons – producer Mike Bobak – engineer Hipgnosis – cover art Charts References UFO (band) albums 1974 albums Albums with cover art by Hipgnosis Albums produced by Leo Lyons Chrysalis Records albums Albums recorded at Morgan Sound Studios