Sound testing software in Java?

Question

How do I make a program that tests a person's sung song against a real song and then tell them how much they sung it precisely? I want the program to decide how much the person song matches to the real thing. What perimeters of sound would be matched or tested and how Java would handle it.
I came up with this idea for my final year project so I really really need some honest help.
Thank you...

Answer 1

I want to suggest Fast Fourier Transform as *part* of your strategy but need to find some details before adding more...I'll plan to come back.