Yodel

v. t. & i.	1.	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. [imp. & p. p. Yodeled, Yodled; p. pr. & vb. n. Yodeling, Yodling.]
n.	1.	A song sung by yodeling, as by the Swiss mountaineers.

Noun	1.	yodel - a songlike cry in which the voice fluctuates rapidly between the normal voice and falsetto
Verb	1.	yodel - sing by changing register; sing by yodeling; "The Austrians were yodeling in the mountains" Synonyms: descant, warble

anthem, ballad, bel canto, bravura, carol, chant, chirp, chirrup, choir, choral singing, chorus, coloratura, croon, crooning, descant, do-re-mi, folk singing, hum, humming, hymn, intonate, intonation, intone, lilt, lyricism, minstrel, operatic singing, pipe, psalm, quaver, roulade, scat, scat singing, serenade, shake, sing, sing in chorus, singing, sol-fa, sol-fa exercise, solfeggio, solmizate, solmization, song, tonic sol-fa, tremolo, trill, troll, tweedle, tweedledee, twit, twitter, vocal music, vocalization, vocalize, warble, warbling, whistle, yodeling