For all the talk of Led Zeppelin being a “heavy metal” band, I would encourage all to take a listen to their bluesy, gospel sound in the YouTube link below. This whole “video” is just a bunch of unreleased audio cuts of the band either rehearsing (interesting to hear their songs played at half tempo!) or studio recordings from 1968-72. Anyhoo, get a listen to this song.
As I try this out, WordPress doesn’t seem to want to let me link to the exact spot in the YouTube video but is just starting from the beginning. The song mentioned above is the last song and starts at 1:12:50. Sorry.