Adding Music to My Music Library
When you add music files to your My Music library, they are placed into the music library in Windows Media Player. The added music files can immediately be found and played back by using My Music in Media Center.
You can also add music files to your music library from within the Windows Media Player program. For more information about adding and deleting music files to the library, use the Windows Media Player Help menu.
Adding music files from your hard disk drive
1 Press the Media Center Start button 
on the remote control, or, with your mouse, click
Start 
on the taskbar, and then click Media Center.
2
3 Press Ctrl+D on the keyboard or press the i (More information) button on the remote control, and select Add Music.
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5 Select Add folders on this computer, and then select Next.
6 Use the arrow buttons on the keyboard or the remote control to select a location. Press the Enter key on the keyboard or press the OK button to expand a folder. When you find the folder that contains your music folder, select it by making sure an arrow appears next to the folder. Repeat this step to add additional folders, and select Next and then Finish.
7 Select OK.