> freaks who can sing perfect sine waves Whistle, don't sing. Try it with a realtime analyzer which shows the fundamental being far more prominent than any har

> freaks who can sing perfect sine waves Whistle, don't sing. Try it with a realtime analyzer which shows the fundamental being far more prominent than any harmonics above it, which means it's close to a sine wave. Then sing various vowels which will show as a series of harmonics whose amplitude ratios change per vowel but are never reduced nearly as much as when whistling.