piano scale
G Dorian
G1A2B♭♭3C4D5E6F♭7
Minor with a natural sixth. The second 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
GWAHB♭WCWDWEHFWG
What is true of it
G Dorian is G, A, B♭, C, D, E and F, and back to G.
Its steps are W – H – W – W – W – H – W, where W is a whole step and H a half.
On the same tonic, G natural minor differs from it by exactly one note.
Chords made only of these notes
CmajorC7dominant seventhDmminorDm7minor seventhEdimdiminishedEm7♭5half-diminished seventhFmajorFmaj7major seventh
Found by testing every chord in the catalogue against these 7 sounds, not chosen.