> why are we assuming that light users prefer indie bands and heavy users prefer pop music?
The article explained this - because heavy users are playing music 24/7 at gyms, etc., and never play the smaller groups or genres that only some individuals like (and would like to support).
I think it depends on local copyright laws, but I think in most places you buy a license to play music publicly and with that license you are allowed to play any music legally acquired.
