FA-81172 / Music interval and transposition theory / Member archive

Chord symbol to pitch classes: trailing text after slash bass ignored · case 02

Symbols like C/Ebm or C/E/G are accepted as if the bass were plain Eb or E.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input a chord symbol: root letter with optional # or b, a quality from "", m, dim, aug, 7, maj7, m7, m7b5, dim7, sus4, mMaj7, 6, and optionally "/" plus a bass note (letter with optional # or b and nothing else). Return pitch classes root-first in template order; for a slash chord the bass moves to the front (removed from its old position if it is a chord tone, otherwise added). Unknown or malformed symbols return None.

Why this case matters

Lead-sheet, accompaniment and guitar-chart tools expand chord symbols into voicings.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
oracle 5	`[3, 0, 4, 7]`	`null`	Failed

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