iTunes 1.0 and later can import and play the following audio file types:
- AIFF
- AIFC
- audio CD
- MP3
- System 7 Sound (SND)
- uLaw (AU)
- WAV
- QDesign
- QuickTime audio (audio only movies)
iTunes 3 and later can also play these additional file types:
- Audible.com (format 2, 3, and 4)
iTunes 4 and later can also play these additional file types:
- AAC (Advanced Audio Coding)
- MP4
To add these kinds of files to your iTunes library or playlists:
1. Click the Library icon in the iTunes window.
2. Drag the file's icon into the iTunes window.
You can also add these sounds to your library by choosing Add To Library from the File menu. If you choose a folder or disk, all the audio files it contains will be converted using your current import preference settings. To change the settings:
1. Choose Edit > Preferences (choose iTunes > Preferences in Mac OS X)
2. Click the Advanced tab (click the Importing tab in Mac OS X).
3. Choose a default encoder from the Import Using pop-up menu.