A while back I was talking with someone about musical tastes which led to a discussion on blues influences which led to me suggesting a project of making a list of Led Zeppelin songs and their roots.

As I see it there were some blues numbers, such as When the Levee Breaks, that Page and Plant stole directly (and I say stole since they didn't give any credit other than themselves), there were some they they borrowed heavily from or that played a definite influence, e.g. Gallow's Pole/Gallis Pole and then there were those where they ran a variation on a prior riff or lyric, such as Moby Dick from The Girl I Love, She Got Long Curly Hair.

What I'd like to see is a list of Zep songs and do one-to-one correlations from each song they wrote to the blues/gospel/folk song that may have been it's influence, wherever possible citing the original author or the artist that made it most known. I've got a list started, but would like to get others' input on songs/sources to find the ones that I've overlooked or have attributed incorrectly.