How to transfer my free music to my IPhone music library?

I'm new to iPhones so bare with me. I downloaded an app to download music for free, and the music saves in that app. What I want to do is transfer those songs to my iPhone music library so I can just tap the music tab (iTunes I guess) and listen to my songs. How can I do that?

Open iTunes and make sure the device is connected to the computer.
Once iPhone is connected to computer, click on the device to bring up the options. IE info, apps, etc. Once there, click on the Apps tab, and scroll down the page. Near the bottom of the page, you will see the app that the music has been downloaded in.

Click on the specific app, and on the right pane there you will see the files that had been downloaded. Those files can then be transferred to the computer, and deleted from within the app.

Once transferred to computer, then they can be transferred to iTunes and then can be synced normally like any other music file.

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