[CuriouslyC]

Sorry but no, this is completely the wrong take. Popular music is less diverse today for the same reason that half the movies released now are Marvel - art is more commoditized, and businesses are more data driven, with the shift towards more public companies also playing a role, as they can't take as many risks as private companies.

What cheap music production tools have done is allow niche subcultures to create music that actually sounds good. Punk, metal and early hip hop all grew from people sharing rare tapes that were poorly produced and sounded like shit, but were a breath of creative fresh air. Now people's unusual creative divergences are stream-able and have production quality close to that of stuff on major labels.