B♭ Augmented 7th
Bbaug7 · Root
Every chord tone stacked from the root up.
Click keys to experiment with the chord
B♭ – D – F♯ – A♭
1 – 3 – #5 – b7
This augmented dominant has the same notes as 7#5 and often functions as a V chord resolving down a fifth. The whole-tone scale is one common sound; the root may be omitted in piano voicings when a bassist supplies it, and +7 is another notation.
The Bbaug7 chord sounds distinctive, with a augmented 7th character. Its notes are Bb, D, F#, Ab. This chord is commonly heard in jazz.