cocos2d/cocos2d-x — pull request #1978 by moadib (2013-02-12 15:09:48+00:00)
Title: Added support for multiple background music sources to CocosDenshion for BB

As i mentioned here https://github.com/cocos2d/cocos2d-x/issues/1976 Blackberry implementation have different behavior compare to Ios, Android and Windows

If user want to preload multiple background musics and switch them then we need something like proposed changes.