Bb dominant seventh chord
Bb7 chord for piano with keyboard diagram.
Explanation: The B flat dominant seventh is a four note chord. You can see the four notes of the Bb seventh chord marked in red color. The chord is often abbreviated as Bb7.
Theory: The Bb seventh chord is constructed with a root, a major third, a perfect fifth and a minor seventh.
Fingerings: little finger, middle finger, index finger, thumb (left hand); thumb, index finger, middle finger, ring finger (right hand).
Notes: Bb - D - F - Ab