How to add music to a map?

[inlacrimas]

I'm trying to add music to my map, but I can't get it to work!

I create a target_speaker, make it global and write the path to the mp3-file in the assets0, but when I start the map, it says it can't find it.

Is this the correct way to add music, or how should one do it?

Plz help!