Answer: yodelled

AnswerCrossword Clue
YODELLEDSang on high?: Var.
YODELLEDPerformed at one's peak?
yodelledYODEL, to sing with a fluctuating voice, also JODEL, YODLE
yodelledPractice a form of singing or calling marked by rapid alternation between the normal voice and falsetto