Bb Lydian (A# Lydian) on Guitar

Lydian is the major scale with the 4th raised a semitone — major, but floating instead of grounded. The notes of Bb Lydian are Bb, C, D, E, F, G, A. Its characteristic note is E — the sharp 4th — the one note that gives this major-type scale its colour.

It is the dreamy, weightless sound of film scores, "The Simpsons" theme, and Joe Satriani ballads ("Flying in a Blue Dream" is a Lydian tutorial with a record deal). The sharp 4th refuses to resolve downward the way a normal 4th does, so the whole scale hovers.

Bb Lydian across the whole neck

Standard tuning, frets 0–12. The gold notes are the root (Bb); every colour marks an interval, the same palette the app uses.

Practice Bb Lydian over a drone →Free, in your browser. It listens through your mic and lights up what you play.

Over the drone, hold the sharp 4th and let it ring — in any other major context it would be a wrong note; here it is the point.

Formula and intervals

R - 2 - 3 - b5 - 5 - 6 - 7 — 7 notes. The natural 3rd makes it a major-family scale.

Chords in Bb Lydian

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	Bb	Major
II	C	Major
iii	Dm	Minor
iv°	Edim	Diminished
V	F	Major
vi	Gm	Minor
vii	Am	Minor

Same notes, different home

Bb Lydian 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 Bb