no no, dont pay attention to minigame or other user that posted

use a bring action and make it for each player and it should not be the same player where the obstacle triggers are
do like:
CONDITIONS
player x brings at least 1 "music mixer"(any unit) to (location
ACTIONS
play Xwav
wait for (wav lenght)
preserve trigger
that's what i do in my bounds...at least its what i remember i do and if you do that you actually get a turn off/turn on music switch just move the "music mixer" to anywhere that its not the locations and it should stop when wav ends