Remember "Babe I'm Gonna Leave You" by Led Zeppelin? Well, before Jimmy Page got his hot little hands on the song, it was sung by Joan Baez. Listen to her version and explain to me how Jimmy and the boys created their masterpiece as we know it today:
This sounds like opera to me. Her voice is beautiful, don't get me wrong, but how did Jimmy create Zep's version after hearing that? I'm gobsmacked.
The song was actually written by Anne Bredon, a student at UC-Berkley. She appeared on a live folk-music radio show The Midnight Special on radio station KPFA around 1960, on which she sang "Babe, I'm Gonna Leave You". A fellow folk singer developed the song further, which came to the attention of Joan Baez.
In my opinion, the song was always meant to be heard like this: