I was watching a TV doco a while ago on yodelling, and it was said that yodelling takes place ON the vocal chords, unlike singing. Perhaps someone with more technical singing knowledge can care to try to explain that... :-)

When I learned how to relax my throat properly, and centralise my larynx, after reading Seth Rigg's wonderful book "Singing For the Stars" - 1985 Alfred Publishing Co ISBN 0-88284-340-0 - I found much more range, power, control and stability in my voice, especially down at the "dungeon" end, as well as up the top... Still couldn't yodel, though...

Robin