RHCPs back in the 80s was basic rock,not alt, not hair, not metal... also B-52s didnt go big until 1994ish-1995.... REM and U2 were big back in the 80s ...yes....and were what you called Alternative back then, but were not a grunge type outfit... just rock that wasnt a hair band nor metal. They were called POP Rock!
Actual Grunge came in with Nirvana, Pearl Jam, SoundGarden, AIC back in 1992-1993... hair bands died out in 1993 due to everyone wanting a change in music style and direction. This lasted until Godsmack came out big in 1998 and went multi-plat...and with Disturbed in 1999....Active Rock-Hard Rock started to make a comeback (without the glam images). Now Active Rock dominates 90-95% of the Active Rock charts...and is about 33%-40% of the Modern Rock charts.