How do I add music to a map?

[Macdeham]

Hi, I pretty much nailed everything to do with mapping doors, lights, triggers, etc. But I just need to know how to do one more thing. Music. How do I put it into a map?

[acdcfanbill]

if you select any regular brush in radiant and press the n key to bring up the entity window, it should bring up the one for worldspawn. then enter the key music and give it a value of the path to whatever song you want it to play.