Also Topdown Rule #1 seems to apply: "If it sounds good, it is good."
I can recall being at a guitar shop and some young guy was noodling around with a Taylor. He was playing some acoustic Zep and nailing it. Absolutely perfect renditions. He looked up at old graybeard me, I supposed for some sort of positive comment or pat on the back, and so I gave it to him. "That was great. Now, play it the way YOU would play it instead of the way Zep played it." He did, and it was freaking incredible. People were poking their heads into the acoustic room, the not-easily-impressed sales rep applauded. It was a totally different reaction to, "Oh boy. Here we go again..." that he started out with.
Two things to cure the idea that songs should always be played like 'the original.'
1. Stevie Ray Vaughan playing "Mary Had a Little Lamb".
2. Jose Feliciano playing "Light My Fire."