| 1 | This piece changes key many times. | |
| 2 | How much variation is there in tone throughout a typical sentence? | |
| 3 | As a result, sound becomes quieter and somewhat distorted. | |
| 4 | Hear a voice crack when it isn't the cracking type? | |
| 5 | If we have to sing a different pitch, then probably the harmony has changed. |