I'm asking because my son has been playing guitar and singing since he was 7. He's almost 14 now and his voice is changing and getting lower. When he sings, his voice is starting to "crack" and the tone is a bit "raspy". I guess my question is; should I let him keep singing through it or should he stop singing for now or just try and sing lower? Any idea on how long the "change" lasts? I never sang when I was young.