$ pip install chords2midi

$ c2m I V vi IV --key C
$ ls
C-I-V-vi-IV.mid

$ c2m I V vi iii IV I IV V --key D --bpm 128 --octave 5 --duration .25 # Pachabel's Canon in D, Staccato EDM Version
$ ls
D-I-V-vi-iii-IV-I-IV-V-128.mid

$ c2m I X V X vi X IV

usage: c2m.py [-h] [-b BPM] [-t OCTAVE] [-i INPUT] [-k KEY] [-n NOTES]
              [-d DURATION] [-H HUMANIZE] [-o OUTPUT] [-v]
              [U [U ...]]

chords2midi - Create MIDI files from written chord progressions.

positional arguments:
  U                     Please supply chord progression!. See --help for more
                        options.

optional arguments:
  -h, --help            show this help message and exit
  -b BPM, --bpm BPM     Set the BPM (default 160)
  -t OCTAVE, --octave OCTAVE
                        Set the octave (default 4)
  -i INPUT, --input INPUT
                        Read from an input file.
  -k KEY, --key KEY     Set the key (default C)
  -n NOTES, --notes NOTES
                        Notes in each chord (default all)
  -d DURATION, --duration DURATION
                        Set the chord duraction (default 1)
  -H HUMANIZE, --humanize HUMANIZE
                        Set the amount to "humanize" (strum) a chord, in ticks
                        - try .11 (default 0.0)
  -o OUTPUT, --output OUTPUT
                        Set the output file path. Default is the current key
                        and progression in the current location.
  -v, --version         Display the current version of chords2midi

 $ c2m I V vi IV

 $ c2m I vi IV V

$ c2m I I I I IV IV I I V V I I

$ c2m I I I I IV IV I I V VI I V

$ c2m ii IV V

$ c2m I IV  V IV

$ c2m vi V VI V

$  c2m ii I V6 VIIb VI

$ c2m vi IV I V

$ brew install timidity
$ timidity your-midi.mid