During spring break, a bunch of us went to waikiki for karaoke and although I didn't know much about the subject at the time, there were a lot of sound waves. Higher voices have a higher frequency. However, because frequency is equal to the reciprocal of the period of the wave, higher voices have smaller periods. Even when frequency changes, it does not affect the speed of the sound wave. This is because speed=frequency x wave length and frequency and wave length have an inverse relationship. This is why two people can be singing a duet at different frequencies, but their voices will be heard by others at the same time. So there really is physics even in singing.
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