John Entwistle was an English musician, best known as the bass guitarist for the rock band The Who. His aggressive yet melodic style, often employing rapid fingerpicking and inventive harmonics, has been influential in the development of rock bass playing. Entwistle's bass work was characterized by its lead-instrument role in The Who's sound, distinguishing him from many of his contemporaries. Notable works include his performances on "Baba O'Riley" and "My Generation," which exemplify his innovative approach to the bass guitar.