concert pitch

Definitions

1. the reference pitch to which a group of musical instruments are tuned for a performance
   countable, uncountable
2. the reference pitch using the standard of A440
   countable, uncountable
3. the pitch that is heard (usually as played by one or more transposing instruments or a combination of transposing and non-transposing instruments)
   countable, uncountable

Equivalents

CEFR level