Is it possible to add custom music to the game?

I would like to clarify: 1) Let's say I absolutely dislike the dungeon music in the game, and I want other players to hear my version instead. Does this mean I first need to reformat my version into a WAV file, export it to the map, remove the paths to the standard dungeon music, and then run this WAV file using a script when the player's heroes touch a location leading to the dungeon? And at the same time, I also need to somehow stop the currently playing file with the previous musical theme.
2) Converting to WAV will significantly increase the map file size, and if there are several such compositions... I read somewhere on the forum that once a certain size is reached, either the map will stop launching, or saves will not work. Is this true?