How to access the iPhone and iPod library files to use audio?

I have an application in which I want to access the iPod and iPhone libra开发者_开发知识库ry files for accessing audios of the library.

Have a look at iPod Library Access Programming Guide. Main class for access and control is called MPMusicPlayerController

If you want to have access to your music files and related information about them, then have a look at the Media Player Framework Reference.