Music Player stops on launching application

I am working on a game for iPhone . I am using cocos2-1.0.1-x-0.13.0-beta . I run my application in iPhone. Now I press menu key , so my application goes behind . Now I play music from music player and now I resume my game . Now what happen is music player’s music stops and my game sound starts . I want my music player’s music to continue and my game sound should pause . Thanks in advance