CLEF top-level constant

Implementation

const Map<(String, int), Clef> CLEF = {
  ("G", 2): Clef(ClefType.treble),
  ("F", 4): Clef(ClefType.bass),
  ("C", 3): Clef(ClefType.alto),
  ("C", 4): Clef(ClefType.tenor),
};