How to transfer the songs on my iTunes to the files on my iPad?

I have Itunes on my ipad. I also have files on ipad. I want to transfer the songs on my itunes to the files on my ipad. I have an iphone and an ipad. No other computers. Im not very technical minded. Is there an easy way?

[Re-Titled by Moderator]

Original Title: Itunes to Files on my ipad.