Bb Mixolydian

The Bb Mixolydian mode (also written A#) — Bb C D Eb F G Ab — shown across the guitar neck.

Also written A# Mixolydian. A# and Bb are the same pitch, though spelling it from A# would need double accidentals (A# B# C## D# E# F## G#), which is why Bb is the name in use.

Swipe the neck sideways to see the higher frets.

Bb Mixolydian is the major scale with one note changed — the b7, Ab. That single note is what the mode sounds like; lean on it and the colour is obvious, avoid it and you are just playing major.

The tool shows this from its parent key, Eb major, with Bb marked as where Mixolydian begins, the same seven notes centered on Eb.