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Led Zeppelin I is littered with old blues numbers rearranged and borrowed. If you read the article there is a lot of interesting information about the origin of some of the tracks. The Willie Dixon stuff is clear and credited, but there were apparently some shenanigans regarding the crediting of songwriters on the rest of the tracks. Suffice to say Jake Holmes is still waiting for his first royalty check for Dazed and Confused. It was a different era when it came to crediting the original songwriters in those days. Some were under the impression that if you rearranged the song you could call it your own. Others figured the songs would never sell or be popular enough to warrant proper credit. Certainly no one really expected heretofore session man extraordinaire Jimmy Page to shake up the world. Zeppelin, of course, need not apologize for their stellar library, but since they clearly borrowed from blues greats (who, in fairness, borrowed from other uncredited and long forgotten deceased artists themselves, let alone each other) for their first three LPs it might be nice to do a little retroactive recognition of still living artists like Jake Holmes. He apparently got some bad information back in the day thinking he couldn't sue and Zeppelin would allegedly just like to keep a lid on their borrowed melodies. I could care less as a huge fan of theirs, but it's not like they need the dough. Long Jake Holme's version is pretty cool for clocking in under four minutes. Enjoy.