What does the use of long vowels in singing primarily ensure?

The use of long vowels in singing primarily ensures a clear, resonant sound because they allow for more sustained phonation, which contributes to better tone quality and projection. When singers utilize long vowels, they enable the vocal cords to vibrate freely and continuously, supporting a fuller resonance in the sound. This technique not only enhances the clarity of the vowels being sung but also allows for a more open throat and mouth, further improving the overall sound quality.

Unlike varied pitch, which relates to the changing of notes in melody, long vowels focus on stabilizing the sound for clarity. A fast tempo primarily refers to the speed of the musical piece and does not directly influence the vowel's quality. Harmonization involves blending different musical lines, which is not directly tied to the quality of vowel sound produced when singing. Thus, the correct association of long vowels with a clear, resonant sound emphasizes their importance in vocal training and choral performance.