Stephen Percy Harris (born 12 March 1956) is an English musician and songwriter, best known as the bassist for heavy metal band Iron Maiden, which he founded in 1975. He is the only member who has been in the band for its entire history, while he and guitarist Dave Murray are the only members who have appeared on all of the band's studio albums. Harris developed an influential style of bass playing, particularly the "gallop" which can be found on many Iron Maiden recordings, such as the singles "Run to the Hills" and "The Trooper". He was the band's primary songwriter in its early history, but in later years he has been more likely to collaborate with his other members of the band. Harris has also assumed other roles in Iron Maiden, contributing keyboards and backing vocals, co-producing albums, and directing live videos. Harris is widely regarded as one of the best heavy metal bassists of all time. He has also led the hard rock side project British Lion.