| A | B |
|---|
| soprano | highest female singing voice |
| mezzo soprano | medium female singing voice |
| alto | lowest female singing voice |
| counter-tenor | rare male voice type that sings in mezzo/alto range |
| tenor | highest male singing voice |
| baritone | medium male singing voice |
| bass | lowest male singing voice |
| unchanged voices | children's voices/treble voices |
| changing voices | adolescent voices |
| changed voices | adult voices |
| breathy | girls voices when they change |
| unpredictable | boys voices when they change |
| cerebral cortex | the part of your brain that controls singing |
| nerves | send signals from the brain to the muscles that help you sing |
| sinuses | fill up with mucous when you get sick |
| mouth | you can change the shape of this to change your sound |
