…you want to learn how to yodel like cowboy Wylie here :
From Wikipedia :
Yodeling (or yodelling, jodeling) is a form of singing that involves singing an extended note which rapidly and repeatedly changes in pitch from the vocal or chest register (or “chest voice”) to the falsetto voice, making a high-low-high-low sound. This vocal technique is used in many cultures throughout the world.
In Alpine folk music, it was probably developed in the Swiss Alps as a method of communication between mountain peaks, later becoming part of the region’s traditional music. In Persian and Azeri classical music, singers frequently use tahrir, a yodeling technique that oscillates on neighbor tones. In Georgian traditional music, yodelling takes the form of krimanchuli technique, and is used as a top part in three/four part polyphony. In Central Africa, Pygmy singers use yodels within their elaborate polyphonic singing. Yodeling is often used in American bluegrass and country music.