Modal RunsC# Mixolydian (Db Mixolydian) on Guitar
Mixolydian is the major scale with the 7th lowered — bright on top, bluesy underneath. The notes of C# Mixolydian are C#, D#, F, F#, G#, A#, B. Its characteristic note is B — the flat 7th — the one note that gives this major-type scale its colour.
It is the default scale of rock and roll: AC/DC riffs, the Grateful Dead, Celtic fiddle tunes, and every 12-bar solo that sounds happy but not naive. The flat 7th is what lets a major key swagger instead of beam.
C# Mixolydian across the whole neck
Over the drone, compare the flat 7th against where your ear expects a leading tone — that relaxed "no need to resolve" feel is the whole mode.
Formula and intervals
R - 2 - 3 - 4 - 5 - 6 - b7 — 7 notes. The natural 3rd makes it a major-family scale.
Chords in C# Mixolydian
These are the diatonic chords — the harmony built from only the notes above. Vamping between any of them keeps you inside the mode.
| Degree | Chord | Quality |
|---|---|---|
| I | C# | Major |
| ii | D#m | Minor |
| iii° | Fdim | Diminished |
| IV | F# | Major |
| v | G#m | Minor |
| vi | A#m | Minor |
| VII | B | Major |
Same notes, different home
C# Mixolydian contains exactly the same notes as F# Major. Nothing about the notes changes — what changes is which one feels like home, and that changes everything about the sound.
Other modes on C#
Keep the same root and swap the scale — the fastest way to hear what each mode actually does.