CHANGE_MUSIC
Usage:
CHANGE_MUSIC <music number>
Description:
When this is triggered, the music changes in the game, just like
using IDMUS ##.
Details:
<music number> references a music entry number from PLAYLIST.DDF.
Useful for triggering music changes for special events, like action music for a fight area (same way Unreal handled music).
Example:
START_MAP map01
  RADIUS_TRIGGER 0 0 -1
    TAGGED_USE
    CHANGE_MUSIC 02 
  END_RADIUS_TRIGGER
END_MAP