Motörhead were a British heavy metal band formed in London, UK in 1975 by bassist, singer and songwriter Ian Fraser Kilmister (24 December 1945 – 28 December 2015), known mostly by his stage name Lemmy, who has remained the sole constant member. The band pre-dated, but are sometimes regarded as part of, the New Wave of British Heavy Metal, which re-energised heavy metal in the late 1970s and early 1980s. Motörhead is also regarded as, with Judas Priest and Accept, one of the first Speed Metal bands.
Motörhead are typically classified as heavy metal, and their fusion of punk rock into the genre helped to pioneer speed metal and thrash metal. Lemmy dislikes such labels, preferring to describe the band's music simply as "rock 'n' roll" and usually opening live shows with the line "We are Motörhead. We play rock and roll." Usually a power trio, Motörhead had particular success in the early 1980s with several successful singles in the UK Top 40 chart. The albums Overkill, Bomber, Ace of Spades, and particularly No Sleep 'til Hammersmith, cemented Motörhead's reputation as one of Britain's foremost rock bands.