If you have your music library in iTunes, you can easily copy the files over to your Barnes & Noble Nook. iTunes won’t detect the Nook as a device and list it within the software like an iPod would, but there is a workaround.
1. Connect the Nook to your computer using the included USB cable.
2. The device should install as a removable disk drive. Locate it under My Computer or Computer for Windows users, or the Finder for Mac users.
3. Open iTunes.
4. From the Music Library screen, right-click any of the top columns, and check the Kind selection. This will enable a column where you will be able to tell which music files are protected and which ones can be copied to your Nook.
5. Use the Kind field to sort your music by clicking it. If a track shows as a Protected AAC Audio file, the you will not be able to play it on the Nook as it’s protected with DRM. Anything else can be copied over and used.
6. Within the removable disk that represents the files on your Nook, you should have a my music folder. Drag and drop music directly from iTunes over to the my music folder.
7. Once you are finished copying the files over, be sure to properly eject the Nook from the computer.
Now you’ll be able to listen to music while reading by selecting audio on the Home screen or Open Audio Player in the Reader.