Baroque A415 Tuning
Tune your piano to Baroque A415 — A3, B3, C4, D4, E4, F4, G4, A4
About Baroque A415 Tuning
A415 is the most widely accepted pitch standard for historically informed performances of Baroque music, setting A above middle C approximately a semitone below modern A440. This lower pitch recreates the sonority that composers like Bach, Handel, Vivaldi, and Couperin would have heard when their music was first performed. The adoption of A415 as a Baroque standard is somewhat of a modern convention, since actual Baroque pitch varied considerably by region and era, but it provides a practical, consistent reference for period instrument ensembles.
During the Baroque period (roughly 1600-1750), there was no universal pitch standard. Church organs in northern Germany often sounded at Chorton (around A466), while French instruments favored a lower pitch closer to A392. Italian pitch hovered somewhere in between. When Bach wrote cantatas in Leipzig, the organ was tuned high at Chorton, forcing him to transpose parts for winds and strings that were tuned at the lower Kammerton. This patchwork of competing standards was a constant headache for composers and performers alike.
Modern Baroque ensembles settled on A415 beginning in the 1960s and 1970s as the early music revival gained momentum. Harpsichord makers began building instruments at this pitch, and it became the de facto standard for period performance practice. Many modern harpsichords include a transposing keyboard that can shift between A415 and A440, allowing the instrument to play with both period and modern ensembles. For pianists exploring Baroque repertoire on period-appropriate terms, A415 offers a window into the sound world these composers actually inhabited.
Reference Notes
Temperament
For Baroque repertoire at A415, a well temperament such as Werckmeister III is historically appropriate. Unlike equal temperament, well temperaments distribute the Pythagorean comma unevenly across the circle of fifths, giving each key a slightly different character. Keys close to C major sound nearly pure, while remote keys like F-sharp major have a more tense, colorful quality. This key-color variation is believed to be what Bach exploited in The Well-Tempered Clavier.
Tuning Tips for Baroque A415
- 1.Set your reference A4 to exactly 415 Hz using a calibrated tuner or tuning app that allows custom reference pitch. Many modern tuners have a calibration feature that adjusts the reference frequency.
- 2.If using a well temperament like Werckmeister III, begin by tuning the series of fifths from C through the sharps (C-G-D-A-E-B-F#) narrower than pure, and leave the remaining fifths (F#-C#-G#-Eb-Bb-F-C) as pure Pythagorean fifths.
- 3.Listen carefully for the characteristic key colors. C major triads should sound warm and nearly pure, while keys with many sharps or flats should sound more active and vibrant. If all keys sound identical, you may have inadvertently tuned equal temperament.
- 4.Allow extra time for the piano to settle after tuning down from A440. The significant reduction in string tension means the piano will drift more than usual during the first few hours. Plan to do a touch-up pass within a day or two.
- 5.When tuning octaves, be aware that string inharmonicity on a modern piano differs from what a harpsichord or clavichord would exhibit. Octave stretching on a modern piano at A415 may need to be slightly less aggressive than at A440.
Best For
Bach keyboard works
The Well-Tempered Clavier, Goldberg Variations, French Suites, English Suites, and Partitas all benefit from being heard at a pitch closer to what Bach knew. The lower pitch reveals a warmth and gravity that A440 can obscure.
Handel and Scarlatti sonatas
Both composers wrote extensively for harpsichord at pitches near A415. Playing their keyboard works at this standard brings out the ornamental detail and dance-like character of the music.
Historically informed ensemble performance
When collaborating with Baroque string players, recorder players, or singers using period technique, A415 is the expected standard. It allows the piano to blend naturally with gut-stringed instruments.
Vocal accompaniment for Baroque repertoire
Baroque arias and recitatives sit more comfortably in the voice at A415. Soprano and tenor parts in particular benefit from the lower pitch, which reduces strain on the upper passaggio.