Instructions
Create a free MP3tunes Music Locker account on your computer. Once created, upload the music you wish to listen to on your Nintendo Wii to your Music Locker.
Turn on your Nintendo Wii and ensure you have the Internet Channel installed and are connected to your home network via the Nintendo Wii.
Open the Opera browser on your Nintendo Wii and direct your browser to "www.mp3tunes.com/wiitunes." Enter your username and password and begin listening to your music collection.