The Who are an English rock band that formed in 1964. Their classic line-up consisted of lead singer Roger Daltrey, guitarist and singer Pete Townshend, bass guitarist John Entwistle, and drummer Keith Moon. They are considered one of the most influential rock bands of the 20th century, selling over 100 million records worldwide and holding a reputation for their live shows and studio work.
The Who's major contributions to rock music include the development of the Marshall stack, large PA systems, use of the synthesizer, Entwistle and Moon's lead playing styles, Townshend's feedback and power chord guitar technique, and the development of the rock opera. They are cited as an influence by hard rock, punk rock and mod bands, and their songs still receive regular exposure. The group have been regarded primarily as a rock band, yet have taken influence from several other styles of music during their career.
From the early 1970s, the band's sound included synthesizers, particularly on Who's Next and Quadrophenia. Although groups had used synthesizers before, the Who were one of the first to integrate the sound into a basic rock structure. Throughout their careers, the members of the Who have said their live sound has never been captured as they wished on record. Live gigs and the audience have always been important to the group.