How to download Music on to your iPhone 4s with itunes?

How do you download songs on to your iPhone 4s. Does it cost money?

You have to either buy music on itunes or import the music to itunes. And then when you plug your iphone in, you click your iphone, and you go under the music tab and add whatever you want. I think you can even drag music from your library directly to your iphone too. And definitely don't trade in your iphone for an android. Android phones are what we call the poor man's iphone.

Plug your phone into the computer, and then drag whatever music or movies or whatever you want on it, to "Bobs" iPod (Or whatever you're name is) lol… It's free to put music onto your iPhone but you have to buy it from "I-Tunes" first