piano scale
E Lydian
E1F♯2G♯3A♯♯4B5C♯6D♯7
Major with a raised fourth. The fourth mode of the major scale.
Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
EWF♯WG♯WA♯HBWC♯WD♯HE
What is true of it
E Lydian is E, F♯, G♯, A♯, B, C♯ and D♯, and back to E.
Its steps are W – W – W – H – W – W – H, where W is a whole step and H a half.
On the same tonic, E major differs from it by exactly one note.
Chords made only of these notes
C♯mminorC♯m7minor seventhD♯mminorD♯m7minor seventhEmajorEmaj7major seventhF♯majorF♯7dominant seventh
Found by testing every chord in the catalogue against these 7 sounds, not chosen.