Modern pop, electronic music or even rap can have fairly difficult tracks that can be used to stress test hifi systems. There are fairly talented artists tucked away inside the "young people" genres. They actually sound good on hifi rigs and don't sound good on crappy rigs (Bose, Sonos, etc) of the "young people".
A bluetooth speaker with a 3 inch driver should do just fine for Beatles (i.e., the whiny 60s boy bands!), rolling stones, etc. You don’t need a hifi rig with badass speakers and subs for the beatles!
Apparently, some guys around here stuck in a time warp think that the greatest music ever made was from 60 years ago. Ooooo, so sophisticated, don’t i know....Read some of the 60s boy band lyrics and it is just as cheesy and sappy as some modern crap.