FA-81314 / Music interval and transposition theory / Member archive

Movable-do chromatic solfege syllables: sharp and flat syllable sets swapped · case 04

Raised degrees are sung with flat syllables (ra, me) when sharp spelling is requested and vice versa.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [tonic_pc, pitch, spelling] with integer pitch values and spelling sharp or flat. The relative pitch class (pitch - tonic) mod 12 maps diatonic degrees to do re mi fa sol la ti; chromatic degrees use di ri fi si li for sharp spelling and ra me se le te for flat spelling. Invalid input returns None.

Why this case matters

Ear-training and sight-singing apps label notes with movable-do syllables relative to the key.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
oracle 0	`"ra"`	`"di"`	Failed

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