from mingus.containers import Note, Bar, Track, Composition
from mingus.midi import midi_file_out
import time

composition = Composition()
track = Track()
bar = Bar()
nota = Note()
nota.from_int(60)
bar.place_notes(nota, 4)
nota.from_int(67)
bar.place_notes(nota, 4) 
nota.from_int(69)
bar.place_notes(nota, 4) 
track.add_bar(bar)
composition.add_track(track)
output_file = "salida.mid"
midi_file_out.write_Composition(output_file, composition, 120)