The line comes from Karn Evil 9, the centrepiece of Emerson, Lake and Palmer's 1973 album Brain Salad Surgery, where it opens the first impression with a carnival-showmaster welcome. The British progressive rock trio built the song around shifting keyboards, complex rhythms and a theatrical narrative, and its opening phrase became one of the band's most quoted lines. Online, creators clipped the welcome alone, stripped of the longer song, and reused it as a standalone signal for returns, revivals and second acts, which keeps it familiar decades later.