The Who are an English rock band formed in London 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.

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.