B♭ Clarinet
Quick Facts
- Instrument Key
- B♭
- Transposition Interval
- Major 2nd down
- Written C sounds as
- B♭3
- Instrument Family
- woodwind
- Instrument Page
- B♭ Clarinet on Tunable
Written vs. Sounding Pitch — Frequency Table
Each row shows a written pitch (as it appears in the score) and the concert-pitch note that sounds when played. Frequencies are equal temperament at A4=440Hz.
Key Signature Conversion Table
When the conductor names a concert key, this table shows what key signature the B♭ Clarinet player reads. The player reads the written key; the audience hears the sounding key.
Practical Scenarios
Orchestra: Playing in a Concert Pitch Score
The conductor calls a rehearsal in C major (concert pitch). The B♭ clarinet player reads D major — two sharps — because every written note sounds a major second lower. When the conductor says "concert B♭," the clarinet player reads C.
Transcribing a Melody for B♭ Clarinet
A pianist plays a melody in F major. To transcribe it for B♭ clarinet so it sounds in F major, write the melody in G major (add one sharp) and up a major second. The clarinet reads G major and the audience hears F major.
Rehearsal: Identifying Wrong Notes by Interval
If a B♭ clarinet plays a written G4 (392.00 Hz written) and the conductor hears F4 (349.23 Hz) instead of F4, the clarinet is in tune — F4 is the correct sounding pitch for written G4 on a B♭ clarinet.
Why Does the B♭ Clarinet Transpose?
The B♭ clarinet was standardized in the early 19th century as the most versatile member of the clarinet family. Before equal temperament became universal, clarinets were built in multiple keys (A, B♭, C) to avoid difficult key signatures. The B♭ clarinet's transposition reflects the instrument's physical construction: its open tube length naturally produces B♭ when the player's embouchure targets C. Modern performers use the B♭ clarinet for most repertoire, switching to A clarinet only for flat-key orchestral works where the key signature would otherwise be extreme.
Tune Your B♭ Clarinet with Precision — Get Tunable.
Tunable's chromatic tuner shows exact Hz values in real time. Tune to equal temperament A4=440Hz or explore all 16 temperament systems.
