If you wanna create a sound file that works on haloce. I can help you with that

http://forum.halomaps.org/index.cfm%3Fpage=topic&topicID=47665

Here's a full scripting tutorial that I made a while back, if you're interested in learning more than just scripting music, which is very simple:

(sound_looping_start directory\to\your\song none 1)
(sound_looping_stop directory\to\your\song)

If you want something more complex, heres a snapshot of the song script I am working on for Sector 09:

;2 - If we're on wave five, play some boss music selected at random.
(if
	(= wave 5)
		(begin_random
		(set music 1)
		(set music 2)
		(set music 3)
		)
)
(sleep 30)
;3 - once the music is selected, play it.
(if
	(and
	(= wave 5)
	(> music 0)
	)
	(begin
		(if
			(= music 1)
				(begin
					(sound_looping_start rzs_halo\s9\assets\sounds\music\perc1\perc1 none 1)
				)
		)
		(if
			(= music 2)
				(begin
					(sound_looping_start rzs_halo\s9\assets\sounds\music\drums\drums none 1)
				)
		)
		(if
			(= music 3)
				(begin
					(sound_looping_start rzs_halo\s9\assets\sounds\music\skyline\skyline none 1)
				)
		)
	)
)