Grace note

{ "mnx": { "version": 1 }, "global": { "measures": [ { "time": { "count": 4, "unit": 4 } } ] }, "parts": [ { "measures": [ { "clefs": [ { "clef": { "sign": "G", "staffPosition": -2 } } ], "sequences": [ { "content": [ { "type": "grace", "content": [ { "type": "event", "duration": { "base": "eighth" }, "notes": [ { "pitch": { "octave": 4, "step": "B" } } ] } ] }, { "type": "event", "duration": { "base": "whole" }, "notes": [ { "pitch": { "octave": 5, "step": "C" } } ] } ] } ] } ] } ] }