Buy or borrow Bart Plantenga's definitive new book about yodeling "Yodel-Ay-Ee-Oooo:The Secret History of Yodeling Around the World" published by Routledge. In it Bart writes, "In the hard dry heart of Texas you'll find some of the sweetest voices. Think juice from a cactus during a drought, and you come up with Randy Erwin. His voice is clear as a proberbial bell in a very tall steeple on a very clear day."
Here are some snapshots of my performance during Bart Plantenga's book reading/lecture at the Library of Congress.
Read some reviews.