Hawkwind are an English rock band and one of the earliest space rock groups. Formed in November 1969, Hawkwind have gone through many incarnations and they have incorporated different styles into their music, including hard rock, progressive rock and psychedelic rock. They are also regarded as an influential proto-punk band. Their lyrics favour urban and science fiction themes. Dozens of musicians, dancers and writers have worked with the band since their inception. Notable musicians to have performed in the band include Lemmy, Ginger Baker, Robert Calvert, Nik Turner and Huw Lloyd-Langton, but the band are most closely associated with their founder, the singer, songwriter and guitarist Dave Brock, who is the only remaining original member. Hawkwind are best known for the song "Silver Machine", which became a number three UK hit single in 1972, but they scored further hit singles with "Urban Guerrilla" (another Top 40 hit) and "Shot Down in the Night." The band had a run of twenty-two of their albums charting in the UK from 1971 to 1993.