I don't agree. I loved pop music  of the 50's and bubble gum music of the 60's.  Perry Como was good. Pat Boone. Rosemary Clooney. The Archies, Andy Kim. Tommy James. They all had that good beat and that good swing.

  Show me one good rock band with a good beat easy to tap my toes to, I'll say today's music is good.

I don't have kids. Have not heard more than one or two good rock songs since 1990. Clearly I don't know where to look.
  Dylan doesn't rock much. Neither does Springsteen. Stones? Haven't heard any good new rock. Santana? Don't know any new good new tunes.
  Don't like rap. Didn't like Curt Cobain, Tragically Hip, Smashing Pumpkins, Blue Rodeo, Justin Beaver, Beyonce, Justin Timberlake, Adele, Lady Gaga, Kanye West, or anything new on FM radio or AM radio or the Grammies.
  Quite a bit of  of good new jazz. Nothing much happening in blues.
  Something happened at the start of the 90's that damaged the spirit of rock 'n roll. I believe it's called fascism.