The B-sharp major sixth-ninth chord (abbreviated "B#6/9 chord") is a five-note chord consisting of the notes B♯, D, F, G, and C. The chord is formed by adding a major sixth and a major ninth to a B-sharp major chord.
B-sharp major sixth-ninth chord
B♯ D F G C
1 3 5 6 9
Pentad (five-note chord)