Put a USB stick in the center console loaded up with your music - copy your iTunes folder to it assuming you're content is mp3
USB, new search, artist, <artist name>, album, <album name>, start playback
The only way to navigate when you've got 10k songs on a usb stick
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Other favorite, navigation address entering - you can tell it the entire address like you were reading the address off a letter
Navigation, enter address, <address>