“Who Are You” was inspired by an infamous night in Pete Townshend's life. After spending the evening drinking with members of the Sex Pistols, Townshend eventually ended up in a doorway, where police found him. The encounter reportedly inspired the question that became the song's title: “Who are you?” The experience, combined with Townshend's reflections on identity, fame, and the changing music scene, became the foundation for one of The Who's most recognisable songs. Tha track was released in 1978 as the title track and lead single from The Who's eighth studio album. It reached No. 14 on the Billboard Hot 100 and No. 7 in Canada, becoming one of the band's biggest North American hits. It was the final studio album released by The Who before drummer Keith Moon's death in September 1978. Decades later the song gained a new generation of listeners when it became the iconic opening theme of CSI: Crime Scene Investigation. In 2006, Roger Daltrey even guest-starred in the series' seventh-season episode “Living Legend,” which featured numerous references to The Who.