Stairway to Heaven remains the biggest-selling sheet music in the history of rock. An average hit sells 10,000 to 15,000 copies of sheet music. Stairway to Heaven has sold well over one million copies.
Stairway to Heaven was performed in almost every concert by Led Zeppelin and it was omitted only on rare occasions, when shows were interrupted by curfews or technical problems. The last time the band performed the song was in Berlin on 7th July 1980, which was also their last show ever as the full band, and this version also was one of the longest ever, lasting almost fifteen minutes.
Stairway is still played 4,203 times a year by America’s sixty-seven largest AOR (album-oriented rock) radio stations, according to trade magazine MONDAY MORNING REPLAY (stat from the early 90s).
US communications company MediaBase lists ‘Stairway to Heaven’ as having been played a total of 1,432,403 times around the world as of May 2008.
The guitar introduction is one of the most famous pieces ever played on the guitar, but was in fact borrowed from the song Taurus by Spirit, who were touring with Led Zeppelin at the time. They have been interviewed about this and apparently do not mind.