The C♭ Major 7th chord is a four-note chord made up of C♭, E♭, G♭, and B♭. It is built from a root, major third, perfect fifth, and major seventh.
Construction
C♭ Major 7th = Root + Major 3rd + Perfect 5th + Major 7th = C♭ · E♭ · G♭ · B♭
| Note | Interval | Degree |
|---|---|---|
| C♭ | Root | 1 |
| E♭ | Major 3rd | 3 |
| G♭ | Perfect 5th | 5 |
| B♭ | Major 7th | 7 |
C♭ Major 7th Inversions
| Position | Notes |
|---|---|
| Root Position | C♭ – E♭ – G♭ – B♭ |
| 1st Inversion | E♭ – G♭ – B♭ – C♭ |
| 2nd Inversion | G♭ – B♭ – C♭ – E♭ |
| 3rd Inversion | B♭ – C♭ – E♭ – G♭ |
Key Signature
A chord has no key signature of its own, but the C♭ Major 7th is the tonic (I) chord of Cb Major, whose key signature has 7 flats (B♭, E♭, A♭, D♭, G♭, C♭, F♭).
B♭E♭A♭D♭G♭C♭F♭
Order of flats
Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.
B♭E♭A♭D♭G♭C♭F♭
Mnemonic: Battle Ends And Down Goes Charles’ Father
Chords in the Key of C♭ Major
These are the triads built on each degree of the C♭ major scale:
How C♭ Major 7th functions in a key
The same chord takes on a different harmonic role depending on the key it appears in. Here is where C♭ Major 7th sits diatonically across the common keys:
- In C♭ major, C♭ Major 7th is the I chord — the tonic.
- In E♭ minor, C♭ Major 7th is the VI chord — the tonic.
- In G♭ major, C♭ Major 7th is the IV chord — a predominant.
- In A♭ minor, C♭ Major 7th is the III chord — a mediant / color chord.
C♭ Major 7th — Frequently Asked Questions
What is the C♭ Major 7th chord on piano?
The C♭ Major 7th chord contains the notes C♭ – E♭ – G♭ – B♭. On piano, play these notes together to sound the chord.
What notes are in the Cb Major 7th chord?
The Cb Major 7th chord (Cbmaj7) contains four notes: Cb (root), Eb (major third), Gb (perfect fifth), and Bb (major seventh). This chord is the enharmonic equivalent of Bmaj7 — same sound, different spelling.
How does Cb Major 7th differ from Cb Dominant 7th?
Both contain Cb, Eb, and Gb. The difference is the seventh: Cbmaj7 has Bb (major seventh) while Cb7 has Bbb/A (minor seventh). Cbmaj7 sounds warm and resolved; Cb7 sounds tense and pulls toward Fb Major.
How is Cb Major 7th used in music?
Cbmaj7 is a theoretical chord that appears in flat-key contexts. In practice, musicians almost always use the enharmonic equivalent Bmaj7. Cbmaj7 exists for theoretical completeness and when notating in keys with many flats.
What genres commonly use Major 7th chords?
Major 7th chords are foundational in jazz, bossa nova, neo-soul, R&B, city pop, and lo-fi hip-hop. They also appear in classical impressionism and sophisticated pop. The dreamy quality is a signature of harmonically rich music.
What songs use Major 7th chords?
Major 7th chords appear in The Girl from Ipanema (Jobim), Don't Know Why (Norah Jones), and countless jazz standards. Whether spelled as Cbmaj7 or Bmaj7, the sound is identical.
Can I substitute Cb Major 7th for Cb Major?
Yes — Cbmaj7 can replace Cb Major for added warmth. Since Cbmaj7 and Bmaj7 are enharmonic equivalents, the substitution works identically regardless of spelling.