From The Collaborative International Dictionary of English v.0.44 [gcide]:
Warble \War"ble\, verb (used with an object) [imp. & p. p. {Warbled}; p. pr. & vb. n. {Warbling}.] [OE. werbelen, OF. werbler; of Teutonic origin; cf. G. wirbeln to turn, to warble, D. wervelen, akin to E. whirl. See {Whirl}.]
1. To sing in a trilling, quavering, or vibratory manner; to modulate with turns or variations; to trill; as, certain birds are remarkable for warbling their songs.
2. To utter musically; to modulate; to carol.
If she be right invoked in warbled song. --Milton.
Warbling sweet the nuptial lay. --Trumbull.
3. To cause to quaver or vibrate. ''And touch the warbled string.'' --Milton.
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
25 Moby Thesaurus words for "warbling": bel canto, bravura, choral singing, coloratura, croon, crooning, folk singing, hum, humming, intonation, lyricism, operatic singing, scat, scat singing, singing, sol-fa, sol-fa exercise, solfeggio, solmization, song, tonic sol-fa, vocal music, vocalization, yodel, yodeling
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