Heavy metal band names

I'm not at all a heavy metal fan, but I thought this chart classifying band names was just awesome.

I was surprised to find out that "Def Leppard" was a deliberate misspelling of "Deaf Leopard." I'm such a visual person that I never would have made a connection between the words. There's a similar story for Led Zeppelin, which dropped the "a" from "Lead" in order to prevent "thick Americans" from pronouncing it "leed"; it refers to the metal, not a position (as in "lead singer").