How to play music in cocos2D or Box2D, iPhone?

This simple code plays a music……..

[[SimpleAudioEngine sharedEngine] playBackgroundMusic:@”my_music.mp3″];

For stopping the music use this…….

[[SimpleAudioEngine sharedEngine]stopBackgroundMusic];

To pause the music use this line of code…..

[[SimpleAudioEngine sharedEngine] pauseBackgroundMusic];