KRBE 1070 had the first Classic Rock format in Houston, and it was FAR SUPERIOR to anything that followed it. Huge playlist and deep tracks. Very similar to what one would have heard on Progressive Rock FM in the late 60's-early 70's. AM stereo as well.
Classic Rock since then has tended to be a narrow "Top 40 of AOR hits" which means lots of repetition of overplayed and burned out music. KZFX was decent, but KKRW is simply awful.
However, KRQX 570 in DFW beat KRBE to the punch with a Classic Rock/Oldies hybrid in 1983, which is still in my mind one of the best programmed stations I have ever heard in my fiftysomething years of listening to radio. Also one of the technically best sounding AM's as well, in AM stereo. Too bad it didn't last, as the format was axed when Belo sold the station in 1987.