Answer: sournotes

AnswerCrossword Clue
SOURNOTES

Clunkers of sorts

SOURNOTES

Instrumentalists' bobbles

SOURNOTES

Poor players hit them

SOURNOTES
Singers' slip-ups
SOURNOTES
Products of Benny's violin.
SOURNOTESBad things to hit
SOURNOTESMusicians' slip-ups