With the Amazon Music app, you can play or download music from your music library on your iPhone, iPad and/or iPod touch running iOS 7 or higher.
If you have an eligible Prime membership, you can stream and download Prime Music using the Amazon Music App. If you're not seeing Prime Music on your device, app, or account, make sure you meet the eligibility requirements, by going to Am I Eligible for Prime Music?
You can install the Amazon Music app from Apple's App Store. Search "Amazon Music" to find the app, and then follow the onscreen installation instructions.
If you already have an Amazon Music account, you can use the same email address and password to sign in to the app. You'll then be able to see and play your entire music library within the app from your Cloud Library.
Your Offline Library shows any iTunes music or playlists you already have stored on your device, as well as the music you've downloaded to your device from your Cloud Library.
To view your library, tap the Menu button and select Your Library. Your current library selection displays in the navigation bar at the top of the application window. Tap to switch between your Cloud Library and Offline Library.
Note: If you update a playlist in your iTunes library, you'll need to re-add it to the Amazon Music app by tapping the Menu icon, Settings and then Add playlists from device in order to see the changes.
If you're new to Amazon Music, you can start adding music to your music library by importing it from your computer.
You can also shop for new music by visiting the Digital Music Store using your device's web browser or your computer. Any music you import to your music library or purchase from the Digital Music Store is automatically available under the Cloud Library tab within the Amazon Music app.