B9 Dominant 7th
The B9 chord is built from the notes B – D# – F# – A – C#.
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Also known as
B7add13B9add#11
Chord tones, one by one
BRoot
Root
The fundamental note the chord is built on — B.
D#Third
Major third
Four semitones — makes the chord major (brighter, happier).
F#Fifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
ASeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
C#Extension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
🎼 Related scales
🎹 Modal analysis
This chord implies the Mixolydian scale; its characteristic note is the minor 7th (♭7).
🎸 Genres
Blues · Rock · Funk · Gospel
🎤 Artists who made it famous
James Brown