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B flat major: scale and chords
B flat major (B♭ major, typed Bb major) has two flats, B♭ and E♭. Its scale is B♭ C D E♭ F G A, its chords are B♭ Cm Dm E♭ F Gm A°, and its relative minor is G minor. The loop below plays four of those chords: move it a semitone, then hum over it.
A semitone up and B♭ major becomes B major. Mika moves bass and chords, never the drums.Four chords of B♭ major over drums and bass, 123 BPM.
The B flat major scale
B♭ C D E♭ F G A
Key signature: two flats, B♭ then E♭. In the treble clef the B♭ sits on the middle line and the E♭ in the top space; in the bass clef the B♭ is on the second line and the E♭ in the third space. Every B and E is played flat unless a natural sign says otherwise. On a piano that is two black keys, B♭ and E♭.
Whole and half steps: whole, whole, half, whole, whole, whole, half. The half steps fall between D and E♭ and between A and B♭. The degrees: B♭ tonic, C supertonic, D mediant, E♭ subdominant, F dominant, G submediant, A leading tone.
Piano fingering, one octave: right hand 2 1 2 3 1 2 3 4, the thumb on C and F (over several octaves the 4th finger takes every B♭); left hand 3 2 1 4 3 2 1 3, the 4th finger on E♭ and the thumb on D and A. Neither black key ever gets a thumb, which is why the left hand doesn't start on 4: that would put the thumb on E♭.
Guitar or bass, one octave from the A string: A string frets 1 and 3 (B♭, C), D string open, 1 and 3 (D, E♭, F), G string open, 2 and 3 (G, A, B♭). Movable, with no open strings: low E string 6 and 8 (B♭, C), A string 5, 6 and 8 (D, E♭, F), D string 5, 7 and 8 (G, A, B♭). The same frets work on a four-string bass.
The chord on the fifth degree, F7 (F A C E♭), pulls back to B♭.
In Hz, from the keynote in octave 4: B♭4 466.2 · C5 523.3 · D5 587.3 · E♭5 622.3 · F5 698.5 · G5 784.0 · A5 880.0
The B flat major chord (B♭) on piano and guitar
B♭ D F
B♭ is B♭, D and F: the root, the major third four semitones up and the perfect fifth seven semitones up. It is written B♭, Bb, B♭maj or B♭M. In this key it is the I chord; it is also the IV of F major and the V of E♭ major.
Piano: B♭ is the top black key of the group of three; D and F are white. Right hand 1 3 5, left hand 5 3 1. First inversion D F B♭ (right hand 1 2 5), second inversion F B♭ D (right hand 1 3 5).
Guitar: x 1 3 3 3 1 (low E to high E, x = not played): the index finger bars the 1st fret from the A string, the ring finger lies across D, G and B at the 3rd. It is the open A shape one fret up. B♭ has no open-string shape, so the full chord is always a barre.
Easier shapes: x x x 3 3 1, three strings with the index finger on the high E only, or x 1 3 3 3 x, the high E muted so the barre only presses the A string. A capo on the 3rd fret makes the open G shape sound B♭; on the 1st fret the A shape does it.
Up the neck: 6 8 8 7 6 6, the E shape at the 6th fret, with the root on the low E string.
Chords in B flat major
Tap a chord to hear it.
| Degree | Chord | Notes | Seventh | Bass, Hz |
|---|---|---|---|---|
| I | B♭ D F | B♭maj7 | B♭2 116.5 | |
| ii | C E♭ G | Cm7 | C2 65.4 | |
| iii | D F A | Dm7 | D2 73.4 | |
| IV | E♭ G B♭ | E♭maj7 | E♭2 77.8 | |
| V | F A C | F7 | F2 87.3 | |
| vi | G B♭ D | Gm7 | G2 98.0 | |
| vii° | A C E♭ | Am7♭5 | A2 110.0 |
The three major chords, B♭ (I), E♭ (IV) and F (V), are the primary chords: the 4 of B♭ major is E♭, the 5 is F. Gm (vi) is the home chord of the relative minor; A° is the one diminished chord, usually replaced by F7.
The loop plays I–V–vi–IV: B♭ F Gm E♭.
Keys that mix with B flat major
On the Camelot wheel B♭ major is 6B (Open Key 11d). Tracks in these keys mix without a clash:
- 6A G minor relative minor, the same seven notes
- 5B E♭ major one step down
- 7B F major one step up
- 8B C major two steps up, the energy boost
B flat major and G minor use the same seven notes and the same two-flat key signature; the home note differs. A song in two flats that keeps landing on Gm, often through a D or D7 chord, is in G minor. Same keynote, the other mode: B♭ minor (3A), five flats, three notes apart (D♭, G♭, A♭).
Where B♭ major sits
| Open strings | In B♭ major | Keynote on an open string |
|---|---|---|
| Guitar E A D G B E | 3 of 6 | – |
| Bass E A D G | 3 of 4 | – |
| Violin G D A E | 3 of 4 | – |
| Viola C G D A | 4 of 4 | – |
| Cello C G D A | 4 of 4 | – |
| Ukulele G C E A | 3 of 4 | – |
Choir parts (soprano C4–G5, alto G3–D5, tenor C3–G4, bass F2–D4, where two part-writing guides agree): B♭3–B♭4 fits the alto part; B♭2–B♭3 fits the bass part; no whole B♭-to-B♭ octave fits the soprano or tenor parts. Find your own range.
As a sub or an 808, the keynote is B♭1 at 58.3 Hz, or B♭2 at 116.5 Hz an octave up. Tune an 808 to B♭.
What plays
Drums, an organ bass and a pluck, the Brumm app's own sounds, four bars at 123 BPM, one chord per bar. The arrows move bass and chords a semitone; the drums stay.
Chord progressions in B flat major
| Progression | In B♭ major | Where it lives |
|---|---|---|
| I–V–vi–IV | B♭ F Gm E♭ | The four-chord pop loop, the one above |
| I–IV–V | B♭ E♭ F | Blues, rock and roll, folk |
| I–vi–IV–V | B♭ Gm E♭ F | The 1950s doo-wop turn |
| ii–V–I | Cm7 F7 B♭maj7 | Jazz: the cadence at the heart of the standards |
| 12-bar blues | B♭7 (4 bars) E♭7 (2) B♭7 (2) F7 E♭7 B♭7 F7 | The jam-session blues, called in concert B♭ |
B flat major on trumpet, clarinet, saxophone and trombone
B♭ is the home key of the wind band. Trumpet, cornet, clarinet and the tenor and soprano saxophones are built in B♭: their written C sounds as concert B♭. So the concert B♭ scale a band warms up on reads differently on each part:
| Instrument | Reads concert B♭ major as | Key signature on the part |
|---|---|---|
| Trumpet, cornet, clarinet, tenor and soprano sax (in B♭) | C major | none |
| Alto and baritone sax (in E♭) | G major | one sharp |
| French horn (in F) | F major | one flat |
| Flute, oboe, trombone, euphonium, tuba, piano, strings | B♭ major | two flats |
Trumpet: the concert B♭ scale is written C D E F G A B C from middle C, valves 0, 1-3, 1-2, 1, 0, 1-2, 2, 0. If your own part says B♭ major (two flats on the trumpet staff), it sounds in A♭ major; written B♭ C D E♭ F G A B♭ from the B♭ below middle C takes 1, 0, 1-3, 2-3, 1, 0, 1-2, 1.
Trombone and bass clef: trombone, euphonium and tuba read at concert pitch, so B♭ major is two flats in the bass clef. The one-octave scale runs from B♭2 on the second line to B♭3 in the space above the staff; on trombone the slide positions are 1, 6, 4, 3, 1, 4, 2, 1. Both B♭s and the F are in 1st position.
B flat major pentatonic and blues scales
Major pentatonic, degrees 1 2 3 5 6: B♭ C D F G. With no half steps in it, no note clashes with any chord of the key. Major blues scale, 1 2 ♭3 3 5 6: B♭ C D♭ D F G, the D♭ sliding into D. G minor pentatonic (G B♭ C D F) is the same five notes as B♭ major pentatonic.
Songs and pieces in B flat major
- Beethoven: Symphony No. 4, the "Archduke" Piano Trio, Op. 97, and the "Hammerklavier" Sonata, Op. 106
- Mozart: Piano Concerto No. 27, K. 595. Schubert: Piano Sonata D 960, his last. Brahms: Piano Concerto No. 2
- Bach: Brandenburg Concerto No. 6. Haydn: Symphony No. 98. Beethoven: String Quartet No. 13, Op. 130. Prokofiev: Symphony No. 5
- Pop, from Hooktheory's song database: "A Thousand Years" (Christina Perri), "Karma Chameleon" (Culture Club), "Brave" (Sara Bareilles)
Questions about B flat major
Why is B flat major so popular?
Because of the instruments. Brass and woodwinds pitched in B♭ play it as their own C major, so concert bands, brass bands and big bands live in B♭ and in its neighbours F and E♭ major. Pop uses it less: Hooktheory ranks it 8th of the 12 major keys in its song database (as of 2026).
Is B flat major the same as A sharp major?
Same piano keys and, in equal temperament, the same sound: B♭4 and A♯4 are both 466.16 Hz. Spelled as A♯ major the key needs ten sharps, with C, F and G double sharp (A♯ B♯ C𝄪 D♯ E♯ F𝄪 G𝄪), so it is always written as B♭ major. Whether a black key is called A♯ or B♭ depends on the key it is used in.
Is B flat major the same as C major?
No. C major has no flats and sits a whole step higher. The two only look alike on a B♭ trumpet, clarinet or tenor sax part, where concert B♭ major is written in C.
Is F major the same as B flat major?
No. F major has one flat, B♭ major two. They share six of their seven notes, sit next to each other on the Camelot wheel (7B and 6B), and F is the V chord of B♭ major.
What modes share the notes of B flat major?
The same seven notes started elsewhere give the modes: C Dorian, D Phrygian, E♭ Lydian, F Mixolydian, G Aeolian (G minor) and A Locrian.
What is the hardest key signature?
On paper, the ones with seven accidentals: C♯ major and A♯ minor (seven sharps), C♭ major and A♭ minor (seven flats). Two flats puts B♭ major among the easiest keys to read. On piano a scale gets awkward where the thumb has to land on a black key, which never happens in B♭ major (fingering above).
Then hum over it
The hum button opens Brumm with a short line in the key over a beat. Hum yours and it becomes an instrument. No account, no upload.
Sources
Scales and chords: Open Music Theory, musictheory.net. Camelot, Open Key: Mixed In Key, Mixgraph. Open strings: Wikipedia. Choir parts: Open Music Theory, Geneseo. Guitar shapes: Wikipedia, Barre chord. Hz: A4 = 440 Hz, ISO 16.
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