How to Transpose for B♭ Instruments
B♭ instruments are the most common transposing instruments in the orchestra and concert band. When a B♭ instrument player reads a written C, the concert-pitch note that sounds is B♭, a major second lower. This means that to write a part for a B♭ instrument that sounds a given concert pitch, you must write the part a major second higher than concert pitch.
The Transposition Rule
- Instrument Key
- B♭ Instruments
- Interval
- Major 2nd (2 semitones)
- Direction
- Written is a Major 2nd (2 semitones) above concert pitch
Concert Pitch to Written Pitch
To convert concert pitch to written pitch for B♭ instruments: go UP a major second (2 semitones). Add 2 sharps to the key signature (or remove 2 flats). Concert C major goes to written D major. Concert B♭ major goes to written C major.
Written Pitch to Concert Pitch
To convert written pitch to concert pitch for B♭ instruments: go DOWN a major second (2 semitones). Remove 2 sharps from the key signature (or add 2 flats). Written D major goes to concert C major. Written C major goes to concert B♭ major.
Worked Key Examples
Concert: C major , Written: D major (2 sharps)
Concert C major (no accidentals). B♭ instrument player reads D major (2 sharps: F♯ and C♯). Every written note sounds a major second lower. Written D sounds concert C, written E sounds concert D, written A sounds concert G.
Concert: B♭ major , Written: C major (no accidentals)
Concert B♭ major (2 flats). B♭ instrument player reads C major (no accidentals). This is the most comfortable key for most B♭ instrument players: no key signature to read. Written C sounds concert B♭, written G sounds concert F.
Concert: E♭ major , Written: F major (1 flat)
Concert E♭ major (3 flats). B♭ instrument player reads F major (1 flat: B♭). Remove 2 flats from the concert key signature to get the written key. Written F sounds concert E♭, written C sounds concert B♭.
Concert: G major , Written: A major (3 sharps)
Concert G major (1 sharp). B♭ instrument player reads A major (3 sharps: F♯, C♯, G♯). Add 2 sharps to the concert key signature. Written A sounds concert G, written E sounds concert D.
Tips and Common Mistakes
Quick tip: For B♭ instruments, the written key always has 2 more sharps (or 2 fewer flats) than the concert key. A useful mnemonic: "B♭ instruments read sharp." The tenor saxophone uses the same B♭ transposition as the soprano and B♭ clarinet, but sounds an octave lower, account for the register difference when writing ensemble parts.
Use the circle of fifths to visualize key signature relationships. Each step clockwise on the circle adds one sharp; each step counter-clockwise adds one flat. B♭ Instruments transposition moves 2 steps clockwise (adds 2 sharps) on the circle.
Instruments in This Group
Transpose with Precision: Get Tunable.
Tunable's chromatic tuner shows exact Hz values in real time. Use Tunable to verify your transposition by comparing written and concert pitch frequencies for all 4 B♭ Instruments.
