Hi Ron, When it comes to scanning some things can be tricky.
I've found the most success for scanning by making sure that you are scanning as grey scale and at 600dpi. Using black and white or color and any resolution lower than 600dpi results in significantly worse results.
But another important question to try and help, what kind of music are your scanning? Is it handwritten or a PDF or a printed part that you are physically scanning into the program?