Stirring this pot again. Not for the sake of stirring, but because I was hepped to a Yardbirds (the snappy dressers above) version on YouTube, and as long as I'm going there, I may as well stir the pot again. Listen to Jake Holmes's original version of "Dazed and Confused". You'll no doubt hear the similarities in both Led Zeppelin's version and the Yardbirds' version. But it wasn't until 2012 that Holmes settled out of court with Led Zeppelin for a piece of the pie. Seems that back in the day, Jimmy Page thought he changed it enough that Holmes didn't need to be credited. Much as I respect Jimmy Page (particularly his appreciation of Link Wray's "Rumble"), he does seem to have a history of borrowing songs. Perfect Sound Forever covered that topic well, so just go there to see what real sleuths dig up.
~ NOTE: ALL MEDIA IS HOSTED BY THE BLOGS & SITES NAMED BELOW ~Listen:
Jake Holmes - Dazed and Confused mp3 at Giant Panther
Led Zeppelin - Dazed and Confused mp3 at Click 2 Houston
Yardbirds - Dazed and Confused at YouTube
Thieving Magpies: Jimmy Page's Dubious Recording Legacy at Perfect Sound Forever
Dazed and Confused - Song entry at Wikipedia