ADR-0035 is complete: the specification for remembered alterations, the system determining when accidentals print in music notation.

The work wasn't driven by technical pressure - the client window won't open for a few weeks yet. But with pitch representation, time signatures, and key signatures all finished, I needed to see these systems work together before proceeding to visualisation. I needed conceptual closure.

The result is a fully deterministic algorithm handling all cases – multi-voice simultaneities, cross-staff notation, grace notes, arbitrary measure patterns – through a single comparison rule. No heuristics. No manual adjustments required. The semantic foundations (explicit temporal ordering, canonical pitch identity, rational metric positions) made this possible.

When Four Systems Align describes how four architectural decisions, made independently for different reasons, composed into something more elegant than planned. ADR-0035 has the complete specification.

– Peter Bengtson