Keith John Moon (23 August 1946 – 7 September 1978) was the drummer of the rock group The Who. He gained notoriety for exuberant drumming and his destructive lifestyle that earned him the nickname, "Moon the Loon." Moon joined The Who in 1964, replacing Doug Sandom. He played on all albums and singles from their debut, 1965's My Generation, to 1978's Who Are You, which was released two weeks before his death.

Moon was known for innovative, dramatic drumming, often eschewing basic back beats for a fluid, busy technique focused on fast, cascading rolls across the toms and cymbal crashes.

Keith John Moon lived in Wembley as a boy, was hyperactive, and had a restless imagination. As a youth, the one thing that could hold his attention was music. A report from his secondary modern school was not encouraging – his art teacher commented: 'Retarded artistically. Idiotic in other respects.' Teacher Aaron Sofocleous praised his music skills and encouraged his chaotic style, even if one school report noted "He has great ability, but must guard against a tendency to show off." Moon failed his eleven plus exam and left school in 1961.