A# Mixolydian Mode: Notes, Chords and How to Play It
A# Mixolydian is a bright, major-sounding scale with a little grit in it. If you have ever wondered how rock, blues and jam players get that happy-but-tough sound over a single chord, this mode is a big part of the answer. It is also a gentle way into modes in general, because it is only one note away from the plain major scale you may already know. Let's get it under your fingers.
The Notes of A# Mixolydian
Here are the seven notes, starting from the root (the home note the scale is named after):
A#, B#, C##, D#, E#, F##, G#
If those spellings make you blink, you are not alone, and nothing is wrong with you. We will come back to them in a moment. First, let's see where the notes come from.
Every scale is built from a pattern of steps. A half step is the distance of one fret on the guitar. A whole step is two frets. Mixolydian uses this pattern:
W - W - H - W - W - H - W
Starting on A# and following it:
- A# up a whole step gives B#
- B# up a whole step gives C##
- C## up a half step gives D#
- D# up a whole step gives E#
- E# up a whole step gives F##
- F## up a half step gives G#
- G# up a whole step brings you back home to A#
On a single string, that means you can play the whole scale by moving up 2, 2, 1, 2, 2, 1 and 2 frets from any A#. Try it slowly on the A string starting at fret 1. It is a great way to hear the shape of the scale before you learn any box patterns.
A Friendly Word About the Spelling
A# Mixolydian is what musicians call a theoretical key. To spell it correctly, with each letter name used once, you need double sharps. A double sharp (written ## here) simply raises a note by two half steps, or two frets. So C## is played two frets above C.
Because that is awkward to read, almost everyone writes this scale as Bb Mixolydian, which has a key signature of 3 flats. Here is the reassuring part: it sounds exactly the same. Same frets, same sound, different names on paper. If a chart or a bandmate says Bb Mixolydian, you are playing this very scale. Knowing both names just means you will never be confused by either.
What Gives It That Sound
The formula for Mixolydian is 1, 2, 3, 4, 5, 6, b7. Compare that with a regular major scale, and only one thing is different: the seventh note is lowered by a half step. That is the flat 7th, written b7.
In this key, that note is G#. It is the star of the show.
A normal major scale has a seventh note that sits just one fret below the root and pulls hard toward it, like a magnet. Mixolydian's G# sits a whole step (two frets) below A# instead. That pull relaxes. The result is a sound that is still major and upbeat, thanks to the major 3rd (C##), but with a bluesy, rock-and-roll edge. It sounds confident rather than sweet.
What to listen for: play an A# chord, then play the notes G# and A# back and forth over it. Hear how the G# sounds cool and loose rather than tense? That's the Mixolydian flavour. Lean on G# in your melodies and the mode will announce itself.
One more useful fact: A# Mixolydian uses the same notes as D# major (D#, E#, F##, G#, A#, B#, C##). The difference is where you treat as home. In Mixolydian, everything starts and resolves on A#.
The Chords From A# Mixolydian
If you stack every other note of the scale, you get a chord on each step. A triad is a three-note chord; a seventh chord adds one more note on top.
- I: A# (A#-C##-E#) / A#7
- ii: B#m (B#-D#-F##) / B#m7
- iii°: C##dim (C##-E#-G#) / C##m7b5
- IV: D# (D#-F##-A#) / D#maj7
- v: E#m (E#-G#-B#) / E#m7
- vi: F##m (F##-A#-C##) / F##m7
- bVII: G# (G#-B#-D#) / G#maj7
Notice two things. The home chord is A#7, a dominant seventh chord, which already contains that G#. And the bVII chord, G#, is the classic Mixolydian move. Going from A# to G# and back is the sound of countless rock riffs and jam-band grooves.
A Simple Progression to Jam Over
Try this loop, one bar per chord:
A# - G# - D# - A#
That is I - bVII - IV - I. Record it, or simply strum A#7 on its own for a few minutes, then improvise over it with the scale. Start and end your phrases on A#, and land on G# whenever you want that bluesy lift.
Finding the Root on the Neck
In standard tuning, your A# roots are easy to find:
- Low E (6th) string: frets 6 and 18
- A (5th) string: frets 1 and 13
Fret 6 on the low E string is a comfortable home base for most players. From any of these roots, the G# that gives the mode its character is two frets lower on the same string. Get used to seeing those two notes as a pair.
Your Practice Plan
Today, keep it small. Play the scale up and down the A string from fret 1, saying the note names out loud. Then loop A# to G# for five minutes and improvise using just A#, C## and G#. Once those three notes feel like home, add the rest. Little and often beats long and rare, and within a week this sound will start showing up in your playing on its own.
For the bigger picture, read The Mixolydian Mode.