Hell live in Alabama and listen to a "classic rock station". Number one they rarely play Led Zeppelin unless it is Stairway to Heaven and they play to friggin much Charlie Daniels Band and Skynard...Between Freebird, Sweet Home Alabama, and anything from Charlie Daniels you don't hear anything else aside from a little Metallica like Nothing Else Matters or One.
BTW my definition of Classic Rock hasn't changed from the late '80s. Anything from the 80's and up should never be considered "classic rock". Thats why stations started an 80's format not long ago for all those one hit wonders.