How do I get music in my Dance Hall?

[Harr0n]

im sure this will be answered in no time but for some reason there isnt any music playing in a Dance Club that i placed in my neighbourhood. Which basically means my sims cant dance. Which kinda kills the whole Dance Hall concept.
I cant build speakers because when i go to buildmode i cant see any furniture just a glass ball that indicates some sort of secret room thing.

so if you know what im doing wrong here let me know :)

[varpunen]

The speakers are in the build menu -> community objects. They are not in the buydebug menu. And also don't use custom music channel because it won't work. Other channels work fine. :)