concert pitch
noun
1.
Music.
a standard of pitch used for tuning orchestral instruments, usually established at 440 vibrations per second for A above middle C.
2.
a state of heightened eagerness, readiness, or tension:
Spring training had brought the athletes up to concert pitch for the beginning of the season.
Origin
1760-70
British Dictionary definitions for
concert pitch
concert pitch
noun
1.
the frequency of 440 hertz assigned to the A above middle C
See
pitch
1
(sense 30),
international pitch
2.
(
informal
) a state of extreme readiness