The A-sharp dominant seventh chord (abbreviated "A#7 chord") is a four-note chord consisting of the notes A♯, C, E♯, and G♯. The chord is formed by adding a minor seventh to a A-sharp major chord.
A-sharp dominant seventh chord
A-sharp major-minor seventh chord
A♯ C E♯ G♯
1 3 5 ♭7
tetrad (four-note chord)