to sing or whistle with trills, quavers, or melodic embellishments

The canary warbled most of the day.

to yodel.

(of electronic equipment) to produce a continuous sound varying regularly in pitch and frequency.

to sing (an aria or other selection) with trills, quavers, or melodious turns.

to express or celebrate in or as if in song; carol.

a warbled song or succession of melodic trills, quavers, etc.

the act of warbling.

verb

carol , chant , chirp , melody , quaver , sing , trill , yodel