UFO is an English hard rock, heavy metal, and space rock band that was formed in 1969. UFO is lead primarily by vocalist Phil Mogg, the only constant member throughout the band’s entire 45 year career. As of 2015, UFO has released 21 studio albums, that feature a variety of musical genres and band lineups.

UFO began by being heavily influenced by the space rock genre, their first two albums heavily featured aspects of space rock, as well as a variety of other genres.

1973 marked a big turning point in the band’s sound when guitarist Michael Schenker joined the group. This caused the band to leave their space rock roots and focus more on a heavy blues rock and heavy metal sound. This lead to the 1974 album Phenomenon, which garnered the band some international fame due to a few hits, including their well known hit Doctor Doctor. In 1978 the group underwent another change when Michael Schenker left the band to rejoin the Scorpions.

UFO still continues to record albums, despite a large variety of different band lineups.