Mode
B Lydian
The B Lydian mode — B C# D# E# F# G# A# — shown across the guitar neck.
Swipe the neck sideways to see the higher frets.
B Lydian is the major scale with one note changed — the #4, E#. 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.
Notes
B C# D# E# F# G# A#
Intervals
1 2 3 #4 5 6 7
Parent scale
F# Major
Degree of parent
4
The tool shows this from its parent key, F# major, with B marked as where Lydian begins, the same seven notes centered on F#.