B13

B1D♯3F♯5A♭7C♯9G♯13

Seven notes in theory and four or five in anyone’s hands: root, third, seventh and thirteenth carry it.

What is true of it

B13 is B, D♯, F♯, A, C♯ and G♯ — 1, 3, 5, b7, 9 and 13 counted from B.

On an instrument that cannot reach all 6, the 5, 9 and 1 go first, in that order.