How about the simple answer of jealousy? Pop music is popular because people like it, and people buy what they like. I suspect that the underground groups are simply jealous that their art is not as appreciated as that of the popular groups.
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Name : Andy-M, Gender : M, Sexual Orientation : Straight, Race : White/Caucasian, Age : 35, City : Orlando, State : FL, Country : United States, Occupation : Engineer, Education level : 4 Years of College, Social class : Middle class,