Modal RunsC#9 Chord (Dominant 9th)
Dominant 9th extends dom7 with a 9th — root, 3rd, 5th, flat 7th, 9th — a dominant chord with extra colour instead of extra tension. The notes of C#9 are C#, F, G#, B, D#.
Funk and soul horn-section harmony lives here: it still pulls like a dominant chord but sits richer and rounder than plain dom7.
C#9 voicings on guitar
Every playable, root-in-the-bass grip standard tuning offers, computed from the chord’s own formula — not a fixed shape library.
Stab it rhythmically on the "and" of a beat, funk-style, rather than holding it — this chord wants to be played, not sustained.
Formula and intervals
R - 3 - 5 - b7 - 2 — 5 notes.
Scales that fit C#9
Every scale below contains all of this chord’s notes — safe territory to improvise in over it.