First of all - this should be in the Recuva forum. If I'm interpreting your post correctly, you reinstalled Vista on your PC, and then realized your music hadn't been backed up. Honestly, there's a good chance you will not be able to get it back. If the drive was formatted, and then had Vista reinstalled, it is most likely you will not be able to get your music files back. The files most likely got written over and will be unrecoverable at this point.
AJ