Progressions in B — Viola
Every chord the key of B owns, mapped along CGDA by finger and position.
B major harmonises to B – C#m – D#m – E – F# – G#m – A#°; B minor to Bm – C#° – D – Em – F#m – G – A. Each chord links to its tone map on the Viola, so a tune in B becomes a short list of places the hand needs to be.
The useful question in a key is which open strings it agrees with. In B, check the chords against the open C and A — a key that leaves an open string ringing under the melody is a key this instrument was built for.