yodel

yodel
    n 1: a songlike cry in which the voice fluctuates rapidly
         between the normal voice and falsetto
    v 1: sing by changing register; sing by yodeling; "The Austrians
         were yodeling in the mountains" [syn: {yodel}, {warble},
         {descant}]
    

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.
   [1913 Webster] Yodel
    

Yodel \Yo"del\, Yodle \Yo"dle\, n.
   A song sung by yodeling, as by the Swiss mountaineers.
   [1913 Webster]
    

59 Moby Thesaurus words for "yodel":
      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