Published by PitchChanger · Updated · How these guides are made
How to use this workflow
Identify the score and instrument
Check the instrument part’s label and whether the score or notation software is showing concert pitch. Do not infer sounding pitch from a written note name alone.
Write down one sounding reference
Use the examples below or your instrument’s transposition reference. Compare a stable sounding note with the recording, keeping octave and fine tuning separate.
Transpose only if the performance needs it
If a different concert key is actually needed, open Pitch Changer, count the signed semitone shift and leave Speed at 100%. Preview the musical register before preparing the export.
Map a written C to its sounding note
The table uses common instrument transpositions, with C4 defined as middle C. These are reference relationships and equal-tempered calculations, not measured instrument recordings. Always confirm the exact instrument: “B-flat instrument” alone does not specify its octave.
Swipe or scroll sideways to read all columns.
| Instrument | Written note | Sounding note | Sounding semitones from written |
|---|---|---|---|
| Concert-pitch piano | C4 | C4 | 0 |
| B-flat clarinet | C4 | B-flat3 | −2 |
| B-flat trumpet | C4 | B-flat3 | −2 |
| E-flat alto saxophone | C4 | E-flat3 | −9 |
| B-flat tenor saxophone | C4 | B-flat2 | −14 |
A clarinet part in D can match a recording in C
A B-flat clarinet part written in D major sounds in C major. If a concert-pitch backing is already in C major, the difference between the labels is expected; no audio shift is needed. Transposing the backing to D merely to match the printed key would create a new mismatch.
For a different task, suppose a pianist has only a C-major chart and wants the entire backing to sound in B-flat major. Lowering the recording by two semitones changes its concert key. That is an intentional performance change, not a conversion of notation into audio.
Account for octave before using the pitch slider
At A4 = 440 Hz, written C4 is approximately 261.626 Hz. B-flat3 is approximately 233.082 Hz; E-flat3 is approximately 155.563 Hz. The relationships follow f × 2^(n/12), with n = −2 or −9. The table’s tenor-sax relationship would require −14 semitones from C4 and exceeds this tool’s single-pass −12 to +12 range.
These values describe reference notes, not a requirement to shift a recording by the instrument’s full transposition every time. A player reads the transposed part to produce the desired sounding notes. If you need another octave or an unusual notation conversion, use the score and intended register to decide the task first.
Check a held tone and the actual phrase
Use an instrument reference or a trusted concert-pitch score to identify a held note in the recording. Then check the phrase’s high and low points. A matching tonic class can still leave the register impractical, and a recording slightly sharp or flat may need cents correction rather than a new key.
PitchChanger sets whole semitones and does not transpose sheet music, select a target instrument, preserve formants on demand or correct cents. Prepare a short audio export only after deciding the intended concert key; keep the source for comparison.
Common questions
Should I transpose every backing for a B-flat instrument?
No. A correctly transposed instrument part can already match a concert-pitch backing. First compare sounding pitch, not only the labels on the part and recording.
Does the song key finder report written instrument pitch?
It analyzes the sounding recording. It does not know which transposing instrument part you are reading or convert the label into that instrument’s notation.