Formatting the USB pen drive would ERASE ALL FILES on the drive.
Just stick the drive into a USB slot on any Windows or Mac or Linux computer and bring up whatever file manager/explorer software you use.
If the computer tells you you it can't read the drive you are SOL.
If you can browse the files on the drive then just right click them to bring up file properties and see what type of files they are exactly.
Like I said, if they're MID or SMF or WAV you have a shot at pulling something out of them. If they're something else you're prolly outta luck unless someone on the web wrote a conversion utility to allow you to use them.
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