piano scale
E Mixolydian
E1F♯2G♯3A4B5C♯6D♭7
Major with a flattened seventh: the scale that fits a dominant seventh chord without altering it.
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♯HAWBWC♯HDWE
What is true of it
E Mixolydian is E, F♯, G♯, A, B, C♯ and D, and back to E.
Its steps are W – W – H – W – W – H – W, 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
Found by testing every chord in the catalogue against these 7 sounds, not chosen.