Sample MIDI messages.

midi_messages.json

{ "type": "set_tempo", "tempo": 600000, "time": 0}, # tick = 0.025 seconds, time is #ticks
...
...
{ "type": "note_on", "time": 0, "note": 60, "velocity": 127, "channel": 0}, # note 60 (Key C4) pressed down                                                        
{ "type": "note_on", "time": 18, "note": 60, "velocity": 0, "channel": 0}, # Release C4 after 18*0.025 sec                                           
{ "type": "note_on", "time": 0, "note": 62, "velocity": 127, "channel": 0}, # Press D4 after 0 sec                                            
{ "type": "note_on", "time": 6, "note": 62, "velocity": 0, "channel": 0},                                            
{ "type": "note_on", "time": 0, "note": 64, "velocity": 127, "channel": 0},                                            
{ "type": "note_on", "time": 12, "note": 64, "velocity": 0, "channel": 0},                                                        
...