The formants which determine vowel quality lie largely in the range of 250–1850 Hz. Since normal speech, male or female, rarely has fundamentals higher than 250 Hz, it is generally assumed in speech studies that the formants modify the harmonics of the laryngeal tone. The same assumption is valid for the lower singing voices with occasional exceptions. The fundamental pitch of the soprano singer however often goes as high as 1320 Hz, and sometimes in the coloratura voice, considerably higher. Very little attention has been given by voice scientists to the interaction of formants and laryngeal tone in this region. The present study has been addressed to the question of whether harmonics of the formants modify the fundamental of the glottal tone in this range (sometimes called the “whistle register”). The presentation will include videotapes of one of the authors (EC), singing tones between 1000 and 1500 Hz, using vowel positions of most of the usual singing vowels. Each vowel had formants whose harmonics reinforce the fundamental pitch, but there is virtually no audible difference in the vowel character of the resulting sounds.