| Roy Harper is a folk singer from England who Jimmy Page met at the Bath Festival in 1970. He became friends with Page and Plant, who used him as the opening act on some Zeppelin tours. |
| In 1971, Page played on Harper's album Stormcock, appearing in the credits as "S. Flavius Mercurius." In 1985, Page recorded an album with Harper called Whatever Happened To Jugula. |
| Zeppelin never performed this live. |
| Roy Harper sang lead on Pink Floyd's "Have A Cigar." He was friends with the band, and they asked him to sing this because Roger Waters' voice was shot. |
| This was listed on the album as "Arranged by Charles Obscure," which was a pseudonym for Page. |
