Today in 1971 the U.S. branch of Atlantic Records released the Led Zeppelin single “Black Dog” / “Misty Mountain Hop” from their untitled fourth album.
Black Dog – The title comes from a black dog that wandered around the recording facility grounds. The song style was supposedly inspired by the start-stop structure of Fleetwood Mac’s “Oh Well”, and the scratching sound at the beginning is Page warming up his Gibson.
Misty Mountain Hop – This one features John Paul Jones on electric piano, and has a “stoned hippie” feel to it. Plant has hinted that it was created in honor of a love-in session in London that was broken up by the police. There’s actually a mistake in the song, (in the line that begins “There you sit…”), but they apparently felt the rest of the take was too good to replace it.