The reason is that you don't add music files to the Windows Music library, and in fact Win8 can play music files anywhere on your local computer, which means that the music file does not have to be added to the Windows Music Library to play, it can be in any folder on any partition on your hard disk. The method is as follows:
Click the "Open or play content" below "play content without adding it to your music library" on the image above to open the screen as shown:
The default display here is the contents of the Windows Music Library, two consecutive clicks "Back to the previous level", will display the "desktop" content, which is very familiar with the "computer", as shown:
There is no need for me to say, click "Computer" will be similar to the ordinary Windows interface operation, you can open any of the partitions in turn the music files in any folder.
Open the Start screen of the music application, the system pop-up prompts "play content without adding it to your music library", you can know that the WIN8 system can play anywhere on the local computer music files, but if the music files are concentrated in the music library, easier to manage and use.