There's certainly plenty to complain about how rock and roll is produced, but it's a huge genre. I don't see why a "classical" artist would have more difficulty using it than gospel. If there's a problem, I think it may have to do with the attitude of "high" artists.
I once visited a sculpture garden where one piece consisted of a sort of face built by concrete contouring inside a hole in the ground. Thinking it was clever, I read the sign where the artist declared that the piece was intended to mock people who like "popular" art that depicted real things. Message: "You liked this? You're obviously an uncultured naive." Someone who thinks that would certainly avoid any "low" art influences.
-Alex
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