UFO are an English hard rock band formed in 1969. UFO became a transitional band between early hard rock and heavy metal and the new wave of British Heavy Metal. UFO's influence was strongly felt in the 1980s heavy metal scene and they have been cited as a primary influence of Steve Harris of Iron Maiden, Kirk Hammett of Metallica, Dave Mustaine of Megadeth and Frank Hannon of Tesla among others.
This introduction is taken from UFO's entry on Wikipedia where more detailed information about the band members and their discography can be found.