British progressive-rock band Pink Floyd released their first single, "Arnold Layne".

Progressive rock is a broad genre of rock music that primarily developed in the United Kingdom through the mid- to late 1960s, peaking in the early-to-mid-1970s. Initially termed "progressive pop", the style emerged from psychedelic bands who abandoned standard pop or rock traditions in favour of instrumental and compositional techniques more commonly associated with jazz, folk, or classical music, while retaining the instrumentation typical of rock music. Additional elements contributed to its "progressive" label: lyrics were more poetic, technology was harnessed for new sounds, music approached the condition of "art", and the studio, rather than the stage, became the focus of musical activity, which often involved creating music for listening rather than dancing.

Pink Floyd are an English rock band formed in London in 1965. Gaining an early following as one of the first British psychedelic groups, they were distinguished by their extended compositions, sonic experiments, philosophical lyrics, and elaborate live performances, and became a leading progressive rock band.

"Arnold Layne" is a song by English rock band Pink Floyd. Released on 10 March 1967, it was the band's first single and was written by Syd Barrett.