Prog rock is a 60s/70s phenomenon actually, still practised is modern forms - and yes, I am a guilty fan.
Funny how it came about - PCs were scouting a camp of an unknown armed group men. Late at night two stealthed up to within hearing range to try to identify the language and hope for some snippet of conversation to ID them.
As GM I rolled a d100 to see how useful the present conversation of the 2 guards was for the PCs and rolled 00. On the spot I had to think of the most trivial subject matter possible....and prog rock loving Poles were born.
Weirdly..I subsequently found out prog rock is really huge in Poland, a band called Riverside being relatively famous.
Maybe you could substitute Brass for prog
