The 2-black-group landmark

Black keys come in repeating clusters — “2” then “3” then “2” then “3”, all the way up. Around every 2-black cluster the white-key names are fixed:

• C · the white key just left of the 2-black group.
• D · the white key between the two black keys.
• E · the white key just right of the 2-black group.

Critically: this is true for every 2-black group on the keyboard.The keyboard is self-similar — there’s a local C-D-E around the lower 2-black cluster, around the middle one, and around the upper one. You don’t need to count from middle C to find them.

How the tiers force the skill

At Tier 1-2any octave’s C counts as a hit, with helper text on. At Tier 3+ each prompt also names a target octave (lower / middle / upper) — your tap has to be the correct white key in that region. Forces you to actually use the local landmark in the octave the prompt names.

Builds on keyboard-landmarks; feeds middle-c-orientation and every later reading lesson.