The F# mixolydian / Gb mixolydian scale has 7 notes: F#, G#, A#, B, C#, D# and E. Its formula is 1 2 3 4 5 6 b7 and its steps, in tones, are 1 – 1 – ½ – 1 – 1 – ½ – 1.
The mixolydian mode is a major scale with a minor seventh: it is the scale of the dominant seventh chord, everywhere in blues, rock and folk.
F# mixolydian
F# G# A# B C# D# E · 1 2 3 4 5 6 b7
Colored dots: notes of the scale, the root is the darkest.