question wit sound/music triggering

[Swift-Brutal-Death]

I'm working on a silent hill map. Basically I want the classic air raid siren sound from the movie to play before zeds start spawning in between waves. Whether its triggered a few seconds into the wave starting or triggered at the end of the trader time is irrelevant. I dont want it looping for the entire trader time though as that would be very annoying.

Any ideas how to set this thing up? I have been trying for a couple hours now without any good results.