[crunch]

The 'normal' is going to start playing as soon as the level starts.
If you put a trigger_multiple by the Allied spawn, if an Axis goes through it, they will also hear the music. I don't know of a way to link the trigger to a player.
Basically what I have shown you is so that your building interiors and building exteriors can have different music. That is why you sandwich entryways (doors/ windows/ any way a player can get in and out of your buildings) with $targetname/interior in the building and $targetname/exterior outside the building.
Of course, you can set up the triggers so different exterior areas play different music, and the same for interiors. It's just a matter of setting up the triggers and remembering the aux channel that the #set pertains to.

Experiment and see what you come up with. And if someone out there knows if/how to bind music to a player, I'm sure they'll help you.

Good Luck.
Kill Ya Later!