Attributing this song to Led Zeppelin is a controversial act, you know. It's the signature song on their classic first album, an acidy blues-metal piece that was the prototype for the band's sound and the centerpiece of their live show. The band just neglected to mention it's not their song. Before Led Zeppelin, Jimmy Page's old band the Yardbirds played a version of "Dazed and Confused," but it wasn't their song either. It was written and originally recorded by moody folk singer Jake Holmes. The song appears on his 1967 album The Above Ground Sound of Jake Holmes.
And it is a mess. https://www.youtube.com/watch?v=pTsvs-pAGDc
Dear Christ, what is that? Of course, the root bass line is there, also the basic idea of the verse singing melody, give him some credit. And actually, the confused tappings and attempts at instrumental brooding at the midway point are the predecessors of the trippy instrumental improv that the two subsequent rock versions would have. But let's face reality: Mr. Holmes didn't know what he had here. Then he made the mistake of playing a show with the Yardbirds, where his song caught the ear of Jimmy Page, who knew just exactly what the hell he had here.
But still when you know the final Led Zeppelin version, the Yardbirds version, while pointed in the same direction, has some laughably inferior elements. https://www.youtube.com/watch?v=3ffBRhtWjEQ
Watch that clip at the URL above to see the Yardbirds performing their "Dazed and Confused." Now listen to the Led Zeppelin version in the link below, assuming you haven't heard it before. The Yardbirds vocalist is Keith Relf, and he seems to be trying extra hard to remind everyone preemptively that he is not Robert Plant. Very, very much not Robert Plant. The mousey, monotone, meandering version of the vocal he provides is dumbfoundingly incompatible with a song that Robert Plant rightly saw as the proving ground for his shrieking vocal attack. The drumming (Jim McCarty) is competent... merely competent, like he was telling himself not to steal the show. Like Robert Plant, Led Zeppelin drummer John Bonham took "Dazed and Confused" and turned it into his clinic on composed savagery, where he brashly butts into the spotlight at every turn. The bass playing is okay in the Yardbirds version, the virtuosic backbone of all the fantastically upgraded improv in the Led Zeppelin version.
In that Yardbirds clip, only one musician looks natural, and that is Jimmy Page, playing a guitar part he kept playing almost verbatim in Led Zeppelin, only with bandmates who were just messing everything up around him. He was clearly ready for a stage and coworkers greater than what he was then supplied with.
In short: This is a Led Zeppelin song!
Someone else wrote its most basic elements, and there should have been an attribution. But everybody else was in a hurry to mess this song up, while Led Zeppelin made it their definitive pre-"Stairway to Heaven" epic.