Short:
Is there anyway to have multiple theme songs for a show as their is for posters. (I hope that makes sense)
Detailed:
Using custom metadata I know you can add posters to your local tv shows as shown here.
https://support.plex.tv/articles/200220717-local-media-assets-tv-shows/
It also allows you to use custom posters per season which a unique naming format.
With that said, could a unique naming format be implemented to do the same where a certain theme song will play depending on which season you select.
Animes have become more popular but obviously they usually come in multiple seasons or sometimes seasons change intros mid way for like a part 1 and part 2.
Currently I have each anime season as it’s own show but would like to clean things up.
Attack on Titan and My Hero Academia for example have multiple seasons with several themes for each season.