Horslips are an Irish Celtic rock band that compose, arrange and perform songs frequently inspired by traditional Irish airs, jigs and reels. The group are regarded as "founding fathers of Celtic rock" for their fusion of traditional Irish music with rock music and went on to inspire many local and international acts. They formed in 1970 and 'retired' in 1980 for an extended period. The name originated from a spoonerism on The Four Horsemen of the Apocalypse which became "The Four Poxmen of The Horslypse".
Although Horslips had limited commercial success when the band was playing in the 1970s, there was a revival of interest in their music in the late 1990s and they came to be regarded as one of the defining bands of the Celtic rock genre. Since that time there have been small-scale reunions, including appearances on The Late Late Show and RTÉ's Other Voices. The band reformed for two Irish shows in the Odyssey Arena in Belfast and the 3Arena in Dublin at the end of 2009, and have continued to play shows since then.