Oh I dunno...I'm going to take a poll when my next class comes in, but I'm willing to bet none of them has ever heard of Pink Floyd (I'm an avid fan). They are 14-17 and have music going constantly.
Oh, probably, most parents don't care what their kids listen to. You can't expect kids to expose themselves to everything in music that has ever been on the planet. Although I absolutely plan on teaching my daughter what Queen, Pink Floyd, Muse, Kasabian, Taylor Swift and all the others are about. The reason is simple. I want to enjoy music together with her, even if it is mindnumbingly stupid music (IMHO) such as the whole Nicky Minaj catalogue.