Answer: sournote

AnswerCrossword Clue
SOURNOTEIt's not well-pitched
SOURNOTEOff-pitch tone
SOURNOTEFlautist's fluff
SOURNOTEBad thing to strike
SOURNOTEIt's unpleasant to end on one
SOURNOTEDiscordant tone
SOURNOTEThis is anathema to the maestro: 2 wds.
SOURNOTESinger's lapse
SOURNOTETrumpeter's blooper
SOURNOTEUnpleasant thing to hit
SOURNOTEPianist's "clinker"
SOURNOTEBit of unpleasantness
SOURNOTEUnpleasant ending