Adding a File from Your Computer
iTunes imports any supported audio file you copy from elsewhere on your computer. Formats include AIFF, WAV, MP3, AAC, and Apple Lossless. You can add the file by dragging it into the iTunes window or by using iTunes’s menus.
In Windows Explorer (Windows) or the Finder (Mac), locate an audio file or a folder containing audio files.
Click the iTunes Library label to view it in the content pane.
Drag the file or folder and drop it in the iTunes window. iTunes imports the file(s).