Is your feature request related to a problem? Please describe.
The event of dimension.(dimID).mainmenu is completely useless, because the main menu music always defaults to event.mainmenu and ignores changing main menu music when leaving the world from another dimension.

Describe the solution you'd like
The main menu music would take into consideration dimension.(dimID).mainmenu, remembering the last dimension the player was in before going to the main menu screen. This would preferably persist between every time you launch and close the game

Describe alternatives you've considered
Have generic main menu music that fits with all dimensions.

Additional context
My WIP modpack is highly improved by music and immersion, and this would help. I'm also going to try and use the menulib mod and custom main menu mod to try and change main menus based on the last dimension you were in, and having this mod support main menu music from the last dimension you were in would complete the immersion.

I've noticied this before too, I though in make it but... I will think