Original music is always perilous. What if people didn't like it?I heard from somewhere someone that the reason they delayed the release of Luminious was to change from all original music entirely into instead original and disney IP... now if it was original entirely maybe that would been the best show and the music wouldn't lack??
Established well-liked IP means the music will be at least well-liked (to most people). That makes it safer. And it pleases a certain percentage of the population that actually want Disney IP.