Thanks to Kenneth Bozeman, Ian Howell, and Chadley Ballentyne for a stimulating two days on acoustics. I connected dots back to Witherspoon's ideas on the subject from 1925 and found many striking parallels.
Quote of the Day
I am of the opinion that vocal masters of the past were listening to the play of overtones in the voices which they were training - it is they who developed the term, "registers." And, I know that better and faster results are obtained when a somnambulistic approach is taken in this acoustical type of [...]