Vlaamse is correct
But to go a little deeper..
You should make an .sqs file first in your mission folder, for example with notepad. Name the file as music.sqs (can be something else too).
Then type in the script what Vlaamse just wrote there but with a little more
_max = _this select 0
_counter = 0
#loop
?_counter == _max: exit
playmusic "mytrack"
~360 (how long the track is)
_counter = _counter +1
goto "loop"
After saving the .sqs file execute it in game (with what ever you're using to play the music; trigger, waypoint,..) like this
[number of times to repeat the song] exec "music.sqs"
for example
[4] exec "music.sqs"