Linked from
The 12 pages that link to Concert pitch, each with the reason it gives.
OrchestrationRelated: It lets a score’s written parts be compared at their actual sounding pitches.
FluteRelated: Flutes are generally built and notated to sound at concert pitch.
Tenor saxophoneRelated: Tenor parts must be transposed to concert pitch for ensemble coordination.
French hornRelated: It clarifies the gap between horn notation and the pitches heard in performance.
OcarinaRelated: Most ocarinas sound at the pitch written for them, simplifying shared notation.
Cor anglaisRelated: Orchestral scores distinguish cor anglais notation from the pitches it produces.