Circle of Fifths
click any note to set your root · ⟳ fifths · ⟲ fourths · straight across = tritone
under the hands
as written
Thirds by Shape
the one thing you mug up — chant them by key-colour
Tritone Mirrors
six pairs — the only interval that inverts into itself
Scale Gym
internalise seconds by running these from your root
M2 = root + 2 · m2 = root + 1 — run them up and down until the distances live in your fingers.