B dominant seventh chord
B7 chord for piano with keyboard diagram.
Explanation: The B dominant seventh is a four note chord. You can see the four notes of the B seventh chord marked in red color. The chord is often abbreviated as B7.
Theory: The B 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, little finger (right hand).
Notes: B - D# - F# - A
B7 - inversions
Explanation: The images below show the three inversions of the B dominant seventh chord. B7/D# is a B dominant seventh with D# as the bass note, B7/F# is a B dominant seventh with F# as the bass note and B7/A is a B dominant seventh with A as the bass note. Note that the fifth sometimes are omitted.