1b735
Fig. 1 · B9 on the keyboard

piano chord

B9

B1D♯3F♯5A♭7C♯9

A dominant seventh carrying a ninth on top.

on guitaron ukulelethe scale

What is true of it

B9 is B, D♯, F♯, A and C♯ — 1, 3, 5, b7 and 9 counted from B.

On an instrument that cannot reach all 5, the 5 and 1 go first, in that order.

B in other shapes

Badd9added ninthBmaj9major ninthBm9minor ninthBmajorBmminorBdimdiminished

C9C♯9D♭9D9D♯9E♭9E9F9all 374