Rule

Rehearsal marks must be strictly sequential with no repeats or reversals

Breaks the readingCheckable from the score alone

Gradus GE-134 · cite this code — it is permanent. Rule id expr-rehearsal-mark-sequence

The convention

Rehearsal letters/numbers (A, B, C… or 1, 2, 3…) increase monotonically through the score with no duplicate and no skipped-then-reused letter.

What goes wrong without it

Measure 20 has `rehearsalMark: "C"`, and a later measure 45 also has `rehearsalMark: "C"` (duplicate), or measure 60 has `rehearsalMark: "B"` positioned AFTER a measure already marked "D" earlier in the piece (reversal).

Authority

Gould, Behind Bars, ch. Rehearsal Marks — sequential, unambiguous labeling is the entire point of the device.

How it is checked

This rule can be decided from pitches, durations and voices — no layout required. A validator can check it before anything is drawn.

Cite this rule

Gradus GE-134 — Rehearsal marks must be strictly sequential with no repeats or reversals. Gradus Engraving Rulebook v1.0. https://gradusmusic.com/engraving/rule/expr-rehearsal-mark-sequence

Rulebook v1.0 · text licensed CC-BY-4.0 · machine-readable at /api/v1/engraving/rules/expr-rehearsal-mark-sequence

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