Not to long ago I had the good fortune to take in Skip Gorman, who states the same as Frank above but also refers to Hollywood yodeling, alot like we know it today, the true yodeling of the american cowboy was more closer to moan than a yodel but with the same vocal gymnastics, which would be soothing to the doggies. I later sent him a tape because of the similarities it had with the musical moanings in some of the prison hollers that were recorded in the 30's-50's. Barry