Bb major
Major key. Scale: Bb, C, D, Eb, F, G, A.
Octaves
Musical context
How the key relates to the chord, scale, mode and progression.
Theory
General info
- Name
- Bb major
- Mode
- Major
- Tonic
- Bb
- Key signature
2 flats: B, E.
- Key character
- Scale degree 3 clearly distinguishes major from the parallel minor, while the leading tone strengthens V–I resolution. In equal temperament, tonic pitch alone does not determine mood; melody, harmony, register, tempo, and texture do.
- Overview
- The Bb major key sets its stable tones and typical harmonic connections. Major keys are built on the Ionian mode (steps 2 – 2 – 1 – 2 – 2 – 2 – 1), minor keys on the Aeolian (2 – 1 – 2 – 2 – 1 – 2 – 2). The number of accidentals marks the key's position on the circle of fifths.
Key composition
1Bbroot
2Cmajor 2nd
3Dmajor 3rd
4Ebperfect 4th
5Fperfect 5th
6Gmajor 6th
7Amajor 7th
Key construction
- Interval formula
- BbWCWDHEbWFWGWA
- Explanation
- The major scale follows the pattern whole, whole, half, whole, whole, whole, half. Its degrees form the key’s diatonic chords, while scale degree 3 defines the major quality.
Related keys
- Relative key
- G minor
- Parallel key
- Bb minor
- Reference mode
- Bb Ionian (major)
Harmonic functions
TTonicI (Bb), iii (Dm), vi (Gm)
SSubdominantii (Cm), IV (Eb)
DDominantV (F), vii° (Adim)
- Overview
- Tonic is the stable centre of a key. Predominant function moves away from tonic and prepares dominant; dominant points toward resolution in tonic. The scheme Tonic → Predominant → Dominant → Tonic describes a basic functional progression but does not exhaust tonal harmony.
Chords by degree
Primary triads
- Tonic triad 1 – 3 – 5
- Subdominant triad 4 – 6 – 1
- Dominant triad 5 – 7 – 2
Bb—D—F
Eb—G—Bb
F—A—C
Tensions & resolutions
VIIAA
IBbBb
In typical voice leading, the leading tone rises by semitone to tonic.
IVEbEb
IIIDD
In dominant harmony, scale degree 4 normally falls by semitone to 3.
IICC
IBbBb
Scale degree 2 may resolve downward by step to tonic.
Harmonic context
Bb major is a major key. Diatonic chords are built on its seven scale degrees, and functional motion commonly connects tonic, predominant, and dominant.
Natural progressions
Cadences
VFF
IBbBb
An authentic cadence resolves dominant function into tonic.
IVEbEb
VFF
IBbBb
A complete functional progression connects predominant, dominant, and tonic.
This key on guitar 🎸
See how Bb major looks on guitar.
Circle of fifths
Usage & Practice
Application in music
- Major-key diatonic chords support motion among tonic, predominant, and dominant without leaving the key.
- The authentic V – I progression emphasises the tonal centre through the leading tone and resolution of the dominant tritone.
- Patterns such as I – V – vi – IV can be transposed into this key without changing scale-degree relationships.
- Musical character depends not only on mode and tonic but also on melody, rhythm, register, tempo, texture, and timbre.
Practice
- Play the tonic chord (Bb), then compare it with the other diatonic chords: tonic serves as the stable centre of the key.
- Alternate Bb and F (I – V – I), focusing on the leading tone resolving to tonic.
- Add Eb (IV): play Eb – F – Bb to hear predominant–dominant–tonic motion.
- Sing the key's scale, emphasizing degrees I, III and V — these are the anchor notes.
- Improvise a melody starting and ending on the tonic to reinforce the sense of center.
Keyboard Trainer
Reinforce it in practice — play and name notes on the interactive keyboard.