iOS read Boolean from Settings.bundle in code

I have set up a Boolean preference in my settings bundle, it works great from that end. In the code part though, I don't know how to read that boolean value. I'm trying to create a setting that toggles the background music off and on. How do I do this after the point of properly creating the .plist?

Can anyone point me to a tutorial or just help me out?

Thanks for your help.