B7

Q: What notes are in the B7 chord?

The B7 chord (B Dominant 7) contains: B, D#, F#, A. Its interval structure is shown above in the Theory section.

Q: How do I build B7 on the keyboard?

Take the root and add the remaining chord tones following the interval formula. The highlight shows chord content, while the inversion control changes which chord tone is in the bass.

Q: Which keys is B7 found in?

The chord acts as a diatonic degree in several keys — they are marked on the circle of fifths in the "Harmonic context" block.

Q: What can I substitute for B7?

A substitution depends on harmonic function and voice leading, not only on shared tones. Computed options appear in the "Substitutions" block and should be checked in context.

B Dominant 7

Octaves

Musical context

ChordB majorTriad

ChordB7B Dominant 7

ArpeggioB majorBroken triad

ScaleB major7 notes

KeyB majorMajor key

ProgressionPop axisSequence

How the chord relates to the scale, mode, key and progression.

Theory

General info

Full name: B Dominant 7
Symbol: B7
Root: B
Quality: Dominant 7

Chord notes

1Broot

3D#major 3rd

5F#perfect 5th

b7Aminor 7th

Functions & resolutions

Typical function in key: VDominant (V)E major
Stability / tension: High tension — requires resolution
Most common resolutions: EE Major C#mC# Minor
Unstable degrees: 3D#
4E
resolves up to the resolution tonic
6G#
b7A
resolves down to the tonic 3rd
Main resolution: B7source
EE Major
Dominant 7th B7 naturally resolves up a 4th to E. It is the tritone between the chord's 3rd and 7th that creates this pull.
Other resolutions: B7source
Deceptive resolution
C#mC# Minor
Instead of the tonic, the dominant resolves to the vi degree. Creates surprise and is often used to extend a musical phrase.
B7source
Modal resolution
AA Major
In rock and blues, the dominant often moves to bVII or IV instead of the tonic, creating a modal flavor.
B7source
Jazz reharmonization
F7F Dominant 7
Tritone substitution: B7 can be replaced by F7 (a tritone away). Both chords share the same tritone between the 3rd and 7th, resolving to the same tonic.
B7source
Functional resolution
Bsus4B Sus4
The dominant can resolve beyond the tonic: moving to IV (subdominant) or to a suspension (sus4) are common alternatives in pop and folk music.

Substitutions

Tritone substitution: F7F Dominant 7

Features

Character: Dominant, tense
Characteristic interval: Dominant 7th (b7)
Description: The minor 7th adds dissonance to a major triad. On scale degree V, the chord’s 3rd and 7th form a tritone that directs the voices toward tonic.
Application: V chord in major (resolves to I)
12-bar blues
Rock, Mixolydian