code for audio control from other apps.

I have an Apple IOS app built already. I'd like to add a media controller. I dont need to play music or videos from my app just want to be able to skip music forward and backwards and play and pause music. for instance if spotify or pandora or youtube is playing in the background. I want to programmatically skip songs or pause music. Your job: Supply the code for me to add into the current app for music control.