Hypertext Webster Gateway: "yodeling"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Yodel \Yo"del\, Yodle \Yo"dle\, v. t. & i. [imp. & p. p.
{Yodeled}, {Yodled}; p. pr. & vb. n. {Yodeling}, {Yodling}.]
[G. jodeln.]
To sing in a manner common among the Swiss and Tyrolese
mountaineers, by suddenly changing from the head voice, or
falsetto, to the chest voice, and the contrary; to warble.
From WordNet (r) 1.7 (wn)
yodeling
n : singing by changing back and forth between the chest voice
and a falsetto
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