As for singing, my voice changed pretty fast, within the first 2 or 3 months. It never squeaked or cracked, it just dropped. I was able to sing the whole way through it. The first thing that happened was I lost my falsetto. Then my bottom range just slowly grew. Now I sing bass in a choir, and am continuing on as a voice major in university. I do encounter problems singing high, because my falsetto hasn't come back yet. I don't know if it does or not. I never felt like I had a cold, and it was never sore, but it was a bit gravelly at first and people said I 'sounded' like I had a cold. It just didn't feel uncomfortable like a cold does.