Answer: bflats

AnswerCrossword Clue
BFLATS

Wind ensembles usually tune to them

BFLATS

A-sharps, by another name

BFLATS

Musical tones.

BFLATS
Notes hit by divas
BFLATS
They're a couple short of C notes
BFLATSThey're higher than A's
BFLATSA sharps