FA-80950 / Music interval and transposition theory / Member archive

Enharmonic respelling on a requested letter: double accidentals excluded from respelling · case 05

G4 cannot be respelled as Abb4 and G4 on F returns None instead of Fx4.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [note, letter]. note: letter, accidentals (# +1, b -1, x +2), nonnegative octave. Return the same sounding pitch spelled on the requested letter in whichever octave needs the fewest accidentals, rendering +2 x, +1 #, -1 b, -2 bb; octave numbers follow the letter (B#3 = C4). If more than two accidentals would be needed return None.

Why this case matters

Pitch spelling and interval arithmetic decide the notes that notation, transposition and analysis tools display or play.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
oracle 0	`null`	`"Abb4"`	Failed

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