Knowing that Stravinsky and Wagner both did not have perfect pitch yet still created works of genius makes me feel that perfect pitch is overrated. Plus the pitch varieS throughout history. For example, a tuning fork associated with Handel, dating from 1740, is pitched at A = 422.5 Hz, while a later one from 1780 is pitched at A = 409 Hz, almost a semitone lower.
No, I’d disagree. A=440 is pretty much standard in all pop, rock music. It only really changes for orchestral music. Having perfect pitch is very useful – a friend of mine has it and he can play any song and accompany it on the piano.
It is also good for a cappella music – imagine a choir of singers with perfect pitch, they wouldn’t need to tune to a standard note at the start.