Collect the 12 Notes by Their Frequency is a node game from the book Illustrated Music from Scratch. You start with the C4 string and each node divides or multiplies its length by 2, 3, 4, 5 or 6: dividing raises the note and multiplying lowers it. Each node has its own vibrating string, plays its sound and lights up its key on the piano, with how many cents it strays from equal temperament.
You tap the ÷ or × circle on a node to add the next one and choose what it divides or multiplies by. In “Complete the keyboard” you collect all 12 notes with as few nodes as possible, against the clock, and win gold, silver or bronze; in “Find the chord” you build the notes of C, Am, G7 and other chords. Your records are saved and the ending can be shared as an image.
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