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