Use the charging cord- the AVR should recognize it and show Phone on the display or in the menu for input devices. Apple got rid of the headphone jack because they wanted to make them somewhat waterproof which, if you consider how little attention people pay to where they are and their inability to hold onto things, is a good idea. You shouldn't need to format the phone, just store the music in the folder that was created in the OS or stream from the provider of your choice (Pandora, Spotify, etc).