How do I use ambient sounds in Zdoom?

Normally Doom/Doom 2 uses a single music track that plays during the whole level.

However, what if I don't want there to be any music and only want there to be ambient sounds instead? I have seen some mods/wads for Zdoom do this, so I know its possible.

How do I do this myself?

EDIT: I already figured the ambient sounds part out, but how do I remove music?

Everything you wanted to know about ZDoom ambient sounds, but never dared to ask: http://zdoom.org/wiki/Ambient_sound

How to remove music: http://zdoom.org/wiki/MAPINFO/Map_definition -- use music = ""