KZOK has added 90's rock from the likes of Nirvana, Red Hot Chili Peppers, and Pearl Jam (among others) to their playlist. At least "Matchbox Twenty" and "Train" haven't made the cut. Perhaps a response to the existence of the new "Rock 98 - 9"
To be fair, Nate Connors in particular would play some Metallica and Queensryche, Black Crowes, and Guns n Roses has been in their library for a while. The new stuff is Alice in Chains ("Man in the Box" and "Rooster"), RHCP ("Under the Bridge" is the only song I've heard by them on the station), and Pearl Jam ("Alive," "Evenflow," and I think "Jeremy.") Amanda J played REM's "Losing My Religion" last night though--not sure I agree with that being in the rotation. Wouldn't be surprised if we hear some early Soundgarden eventually given their connection to the Pacific Northwest, maybe some Mudhoney too.
I think there's just enough of it for variety but it's jarring. Classic rock isn't usually dark in the same way the grunge stuff is. With classic rock, the problems are often "out there" in the world. With grunge, the problems are usually emotional/psychological and they seem to be hopeless. Of course there are exceptions. Nevertheless, the tonal shift of going from Suffragette City to Man in the Box to One Way Out seems extreme to me.