I know how to make custom sounds but I don't know how to use one as a background song. For example in Prison Mission by ZK and Mob of the Dead there is music playing in the background. I have the sounds and can use them in the jukebox or by trigger but I don't know how to set them to be background music.

P.S. I also have custom round change music as well and I don't want the two to play at the same time.

My attempt which failed was to go into dlc_share.csv and change this line:

mx_zombie_wave_1,Stream\Music\Mission\zombie\mx_wave_1.wav,,,0.1,0.1,,,,,,,music,,,0,,,,,,,2d,streamed,,looping,,,,,,,,,,,,,,0,,,,,,100,100,0.25,1,,

by just adding my sound like this:

mx_zombie_wave_1,amb\motd.wav,,,0.1,0.1,,,,,,,music,,,0,,,,,,,2d,streamed,,looping,,,,,,,,,,,,,,0,,,,,,100,100,0.25,1,,

and adding sound,dlc_share,,all_sp to my mod.csv in launcher
But It didn't work.

If I leave dlc_share.csv alone I can hear the default zombie background music playing quietly in the background in my map so if I can just change that sound to mine then all world work, i'm guessing.
If someone can help me out that would be awesome. 

You could create a trigger_touch at the beginning of your map and at some other places to play custom sounds and music, but I've also sen some tutorials arround how to create ambient sounds, checking them out might help you.

Thanks what websites? I've been looking but I cant seem to find background music? I can set them to triggers but It might cause problems later such as music playing over each other. I know how to make other sounds such as looping from a struct or a playing when triggered. This is the one that I couldn't find a clear tutorial on.

Yaph1l posted this link some day's ago, havent taken a deep look into it so don't know if it's any good to you..
Maybe there's something else on CoD-Wiki about background-music, dunno..

http://wiki.modsrepository.com/index.php?title=Call_of_Duty_5:_SP_-_Enviromental_Audio_System

Sweet I can probably use this and make each room have its own sounds. Sweet! I'm gonna bookmark this. Thanks BluntStuffy.    

NP. I looks like a pretty cool and usefull way to set up sounds! To bad i saw this to late for the Sumpf-update  But i will def give it a try to!