What started out in 1989 as something of a bet challenge between two A&R guys from two major record labels, that HYPE can make a talent-less hack a "superstar", sadly today is the eagerly followed upon the business norm of major ( and minor schmo ) record label corporations today.
Early as 1978, the seeds of Hip-Hop's popularity was growing, when it cleverly appealed to the ever rebellious white female teen sales demographic......where it embarrassingly led the dumber white male ( who'd do anything to get laid ) markets. Blondie tried warning the U.S. Rock audience markets, through a "sample song" titled, "Rapture" ( which ghetto rap was BIG in the UK back then ), that this was fast growing music trend.
And the Rock market musician's strike of 1982 didn't really help matters either, as U.S. major record lables fought back by flooding their American markets with the trendy UK club and Hip-Hop / Rap music markets, which by 1987, was infecting U.S. market demographics.
By 1990, what U.S. music audiences coveted once as "classic" Rock n Roll, pretty much died; the big arena rock bands---go ahead and name them---never really recovered from shooting themselves in the foot, taking on the major labels. Hip Hop / Rap found their opportunity---and used illegal drug sale "front money" to push their "music" forward.........we know what happened from there.
I personally consider Nirvana, Urge Overkill ( the guys with the one-hit wonder, "Sister Havana" ) and Pearl Jam, were the bands that fairly much ushered out the bluesy guitar rock sound---and opened doors to the awful garbage we today know as "alternative rock", followed with the even worse, "new country". And ghetto rap has gotten more sewer-esque and violent; with illegal drug cartel money fronting it, don't look for gangsta rap to fade out anytime soon.