Is there an APP or a way that I can transfer my IPod music to my IPhone for free?

Feedback would be helpful.

Back it up on Itunes on your ipod then plug in your iphone and back it up and then everything from your ipod goes into your iphone

Save all of the music from your iPod on to intones on your computer then plung in your phone and save them on it. Or you could use iCloud if they are under the same account