Currently to each map can be associated a BGM (.ogg or .mp3 or .wav) that will be repeated endlessly after they finish playing until you'll go to a map with a different BGM.
What I seek is a script that allows to have not one but two BGM for every map. The first file (for example Sad_Theme_01.ogg) will represent the introduction, while the latter file (for example Sad_Theme_02.ogg) will represent the next part which will be repeated indefinitely, until you'll go to a map with a different BGM.
I do not know if such a thing already exists or is feasible, but I hope so