Stairway to Heaven was released by Led Zeppelin in 1971 on their untitled fourth album, commonly called Led Zeppelin IV, and quickly became one of the band's signature songs despite never being released as a single in the United Kingdom or United States. Its quiet acoustic opening, written by Jimmy Page and Robert Plant, contrasts with the louder rock climax that follows, which helped it become a staple of classic rock radio. Decades later, the intro remains instantly recognisable in films, adverts and online edits, where a few notes alone signal something epic, nostalgic or tongue-in-cheek.