The Rise of A=440

How A=440 rose from local customs to an international standard, and why orchestras still disagree.

Related

PitchConcert PitchOrganBaroque

Before an orchestra plays, an oboe often gives an A. It sounds natural, but it is a convention left by a 1939 conference. Before that, pitch varied from city to city.

The question

Instruments must agree, and makers need fixed sizes. But agree on whose pitch? Church organs, court bands and opera houses had traditions, and winds drift with temperature. A pitch standard is acoustics and power.

Historical arc

Before 1700, local churches and courts set pitch. As orchestras and halls grew, makers pushed pitch upward, and singers complained. France fixed A=435 in 1859, and Vienna reaffirmed it in 1885. A 1939 London conference recommended A=440; radio and records spread it after the war. ISO took it up in 1955 and set ISO 16 in 1975. Berlin and Vienna still tune to 442 or 443, while early-music groups return to 415.

The turning point

The shift was not a discovery but a transfer of listening to standards bodies. Radio and records carried one pitch everywhere; factories built to 440 and conservatories taught it. A=440 is not more correct than 435, only cheaper for trade.

What to listen for

Hear Vivaldi's Spring, born before any international standard; Beethoven's Ninth, written in a Vienna without one; Mahler's Ninth, when pitch still drifted; and Shostakovich's Tenth, in the postwar world of 440. The library renders MIDI in modern equal temperament, so listen to each work's place in the story, not its historical pitch.

Related

Pitch itself is Pitch, orchestral tuning is Concert Pitch, the organ is the stubborn witness Organ, and the pressure to standardise arrives after Baroque.

Sources

• The New Grove Dictionary of Music and Musicians, 2nd ed., entry "Pitch" — history and dates checked, not quoted
• Bruce Haynes, A History of Performing Pitch, The Story of "A" (Scarecrow Press) — background checked, not quoted

Used for fact-checking only; all prose is original.