Give a option to ignore unknown event type.

[elonzh]

I tried to open the file with jazz-soft/JZZ, mido/mido and other MID players, everything looks good.

Maybe the parser has some usability issue?

MID file:

Mondstadt.mid.zip

...
File ~\AppData\Local\pypoetry\Cache\virtualenvs\venti-EiNbpQ-n-py3.9\lib\site-packages\mingus\midi\midi_file_in.py:276, in MidiFile.parse_track(self, fp)
    274 (delta_time, chunk_delta) = self.parse_varbyte_as_int(fp)
    275 chunk_size -= chunk_delta
--> 276 (event, chunk_delta) = self.parse_midi_event(fp)
    277 chunk_size -= chunk_delta
    278 events.append([delta_time, event])

File ~\AppData\Local\pypoetry\Cache\virtualenvs\venti-EiNbpQ-n-py3.9\lib\site-packages\mingus\midi\midi_file_in.py:303, in MidiFile.parse_midi_event(self, fp)
    300 # I don't know what these events are supposed to do, but I keep finding
    301 # them. The parser ignores them.
    302 if event_type < 8:
--> 303     raise FormatError(
    304         "Unknown event type %d. Byte %d." % (event_type, self.bytes_read)
    305     )
    307 # Meta events can have strings of variable length
    308 if event_type == 0x0F:

FormatError: Unknown event type 3. Byte 60.