Piano Key Button
A dark lacquered practice screen, "Keys — Daily practice", with a lesson card and a little stave above a burgundy felt strip and three big ivory piano keys with black keys between them; each key is a call to action ("Warm up", "Lesson 14", "Free play"). Press one and it pivots down at the back, the hammer behind it flicks up against its ringing strings, rings of the key's colour spread across the screen, its label rolls up into the note name and the note on the stave lights. Hold C and G together for the chord that completes the exercise, and the streak chip pulses and rolls from 12 to 13 days.
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React Native · Expo SDK 52+, TypeScript
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