iTunes for Windows: Import music and video already on your computer
Do either of the following:
1. Drag a file or folder from the desktop to the iTunes window. If you add a folder, all the files it contains are added to your library.
2. In iTunes, choose File > Add to Library or Add Folder to Library, locate a file or folder, then click Open.
https://support.apple.com/kb/ht1473
Visit HasenChat Music on iTunes
https://itunes.apple.com/us/artist/hasenchat-music/520586662