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Adding music files and music streams to My Library helps you build and organize your digital media collection. You may add MP3, mp3PRO, WAV, WMA audio files and audio streams.
My Library is also the place to perform a variety of file management and enhancement tasks such as Tagging, Volume Leveling, searching, and sorting audio files.
Once you have added a song into My Library you can't rename or move the original file. If you do, you will need to re-add that song to My Library.
See also