"Weird Al" Yankovic is an American singer and probably one of the best musical artist of modern times, and therefore one of the most liberal. He is also Vegetarian so there's some proof. He asks artists before he makes his parodies so the industry doesn't shoot him like they did 2Pac. Yankovic is a parody artist and probably the most famous in the genre.
Michael Jackson ("Weird Al" parodied multiple songs of his)
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