Add Songs Already on Your Computer to Your iTunes Library
If you have songs on your computer encoded in file formats that iTunes supports, you
can easily add the songs to iTunes. To learn how to get songs from your computer into
iTunes, open iTunes and choose Help > iTunes Help.
Using iTunes for Windows, you can convert nonprotected WMA files to AAC or MP3
format. This can be useful if you have a library of music encoded in WMA format.
For more information, open iTunes and choose Help > iTunes Help.
Setting Up iPod classic