I don't pay a ton of attention to background music mainly because I'm listening to a 10yo jabberjaw from the time I wake. I will say I enjoyed hearing my style of music at Villians night a couple weeks ago though.
We went in late November in 2017. I agree, I love Christmas music too, but we do tend to get over saturated with it during the season. Nothing beats Disney music. I will say though, that prior to the fireworks I can recall a very special moment in front of the castle. First off, the castle had those blue lights lighting it up and it looked beautiful. But as I was cutting across the main hub it was quiet as people were waiting and the rarely heard Christmas song "O Come Little Children" was being played over the speakers. Wow, just chills down my spine. So even when the often over-used Christmas music is being played Disney can still get that right.I remember when I went to WDW during Christmas time in 2015 I was actually disappointed that all the park music was changed over the Christmas music. Don’t get me wrong... I love Christmas but I love WDW park music that much more. It’s one of the reasons I don’t want to go during Christmas time again.