Your challenge, if you choose to accept it, is to, with a POD no earlier then January 1st, 1900, make classical music the most dominant form of music in the Western world. You can have the styles change into something more modern or radical, but (if possible) it has to be the preferres choice of the laymen, i.e what rock/pop/hip-hop is in OTL, as well as producing most of the new music being written. Any hope at all?