When a file or files are deleted on your computers hard drive, they are realy still there, all that happens is a code is put on that part of the hard drive saying its a free space again so a new file in the future could be saved there over it. But more than likely its not done that yet and your files are still there just hidden to you.So this means you can still recover your music files by getting a special program that recovers them. There are many versions out there to buy. disk recovery wizard is one iv used in past. they find allsorts of old files,pictures that have been deleted in the past.The program scans your hard drive just like a virus checker does and can take a few hours if you have a large hard drive. If theres alot of music you have lost then it will be worth it to purchase a file recovery program.