"This scale is cool and has that whole dark Middle Eastern feel to it. It’s got the flat 5 or “tri-tone” in there, which is always great for metal. That’s the interval that Marilyn Manson used on “The Beautiful People” or that Black Sabbath used on [...] “Symptom of the Universe." You can get some crazy-sounding metal riffs out of this scale."
January 1, 1970
https://en.wikiquote.org/wiki/Persian_scale