For belt, Jan Sullivan is something of an expert, though I personally could not stand reading her The Phenomena of the Belt Pop Voice, not least of all because she thinks ‘phenomena’ is singular.
Clayne Robison’s Beautiful Singing: Mind Warp Moments is equal parts biography, essay on releasing creativity, and quantitative/physiological study of measurable correlates of vocal beauty. I love it, and it has made a difference in my voice and my thinking.
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