Develop iPhone application to play media

Connect the speakers of multiple iPhones to play from a single media source (iPhone). Description: Through Bluetooth / Wifi/ or other easily and reliably connectable methods connect many iphones to play a song or youtube video from a single iPhone source. To explain a little more about the App, the intention will be to make the first connection or 1 phone free. The basic App will allow to connect 2 phones for free. moving forward more connections will be at a cost up to a certain ammount of phones (Testing needed). In terms of distance I expect for the phones to be no further than 15-20 feet apart. So perhaps bluetooth would be good becuse you do not need a network correct? Although it would be good to have both options Bluetooth and Wifi (Reliability testing needed). To explain a little bit about the media, the idea is that the phone playing the media will access content from Music library, Youtube, Soundcloud, Pandora, and Spotify. There could be buttons for each Source. And once you find what you want to play you will broadcast it to other iPhones that will connect with the App and play the content through the iPhone speakers.