Cb Major
Key Signature
| Property | Value |
|---|---|
| Tonic | Cb |
| Mode | Major |
| Accidentals | 7 flats |
| Key Signature Notes | Bb, Eb, Ab, Db, Gb, Cb, Fb |
Cb major has seven flats and is enharmonically equivalent to B major. It is theoretically constructed and rarely used in practice but appears in some theoretical contexts.
Diatonic Chords
The seven diatonic chords of Cb Major — each built on a scale degree using only the notes of the key signature:
| Degree | Roman Numeral | Chord Type | Chord |
|---|---|---|---|
| 1 | I | Major | Cb Major |
| 2 | ii | Minor | C# Minor |
| 3 | iii | Minor | D# Minor |
| 4 | IV | Major | E Major |
| 5 | V | Major | F# Major |
| 6 | vi | Minor | G# Minor |
| 7 | vii° | Diminished | A# Diminished |
Related Keys
- Relative Minor
- Ab Minor — shares the same key signature.
- Parallel Minor
- Cb Minor — same tonic, different key signature.
See all key relationships on the Circle of Fifths.
Scales in Cb Major
Common scales built from the Cb tonic:
Transposing Instrument Context
Bb instruments (trumpet, clarinet, tenor saxophone) read in Db major to sound Cb Major. Eb instruments (alto saxophone, Eb clarinet) read in Ab major to sound Cb Major. Flat-key signatures are particularly comfortable for woodwind instruments designed around Bb and Eb transpositions.