A Dorian — Viola
A Dorian along CGDA — string, finger, and position for every degree.
A Dorian is 7 notes to the octave (modes family), drawn here along the Viola's CGDA strings with every A named, so home is findable from any finger.
Minor with a raised 6th (natural 6) — soulful, smooth, and less dark than natural minor. The quintessential jazz-minor and blues mode.
Heard in: "So What" (Miles Davis), "Oye Como Va" (Santana), "Eleanor Rigby" (Beatles) — rock, blues, funk, jazz.
Because the strings climb in fifths, one hand position covers a wide span of the fingerboard — four fingers, a fifth of range per string, and the same finger pattern repeating across every neighbouring pair. Learning a scale here is mostly learning WHICH position it wants and where the shifts fall.
Open-string drones: every one of the Viola's 4 open strings belongs to A Dorian — the C string (the third), the G string (the seventh), the D string (the fourth) and the A string (the tonic) — so they can ring beneath the line as a fixed reference.
The C string and the A string are chord tones of the A tonic triad, so they stay consonant against every degree of the scale.
Play it slowly with a long bow, one note to a stroke, and listen for the notes that pull sharp or flat against the open C and A. Intonation on this instrument is a conversation with the open strings — nothing on the fingerboard decides it for you.