Mediafrog hit the nail on the head for KTBZ, and this isn't unique for Houston. Nearly every major market seems to have this gaping hole, including Miami. I'm 45/W/M and there are very few stations playing "my music" as someone who does not listen to urban/rhythmic (KTBZ does a good job of covering my generation's tastes).
Traditional classic rock is familiar, but too old and frankly burned out for Gen Xers. It's our parent's music and we've heard Sweet Home Alabama for 40 years. *gags*
Ironically, Lafayette LA now has 2 stations dueling it out for 90s-2000s rock with one playing a few currents (KYMK) and the other not (KPCZ, started out as an internet station and moved to simulcast on a terrestrial signal).