What songs from the last 20 years will they be playing 100 years from now?
Zero, I'll wager. Goes double for "Rap."
"Classic" stations play music from 30-45 years ago.
There are no "Classic grunge" stations to the best of my knowledge.
How often do you hear Nirvana - or any other gen-X music - played on any radio station, "Classic" or otherwise?
Smashing Pumpkins, Counting Crows, Hootie and the Blowfish, Nickelback, The Gin Blossoms... nobody gives a ripe f*rt for any of them any more. Know why? Cause they're garbage, that's why.
We are running out of bands that can fill stadiums, I think U2 may very well be the last band able to do so.
The Beatles are dead. Pink Floyd keeps going and going, as a classic group. Not together any more but their albums and Roger Waters Wall tour are still selling like mad. The Wall tour has been the highest attended tour in the last 3 years. He is 68 yrs old and he still gets up there and runs around the stage and throws a hell of a show. No Disrespect to you.
I hear Nirvana, Pearl Jam, Smashing Pumpkins, etc. regularly on my local "modern" rock station. I laugh when this call this stuff modern. It's 20 years old!
Anyways, I'm done with CDs and radio. I'm done with buying music. I've discovered Pandora and that's all I listen to. I type in the bands that I like and Pandora creates my own radio station (with not only the bands I selected but other bands that Pandora's "music DNA" have found to be similar).