munotes

musical-notes

This library is for handling notes and chords in Python.

• PyPI
• API Reference

General Usage

Note

Note class. Handling note.

This class is used by inputting the note name and octave height, or MIDI note number at initialization.

import munotes as mn

note = mn.Note("A4")
print(note) # A4

note = mn.Note(69)
print(note) # A4

• transpose()

Transpose the note.

note.transpose(2)
print(note) # B4

• render()

Get the waveform of the note.

import matplotlib.pyplot as plt
y = note.render('sin')
plt.plot(y[:200])

squere and sawtooth are also sapported.

y = note.render('squere')
plt.plot(y[:200])

y = note.render('sawtooth')
plt.plot(y[:200])

Arbitrary waveforms are also supported.

y = note.render(lambda t: np.sin(t) + np.sin(2*t))
plt.plot(y[:200])

• play()

Get IPython.display.Audio object.

Notes

Notes class. Handling multiple notes.

This class is used by inputting the notes at initialization.

notes = mn.Notes("C4", "E4", "G4")
print(notes) # C4 E4 G4

Methods are the same as Note. Ex: transpose(), render(), play().

Chord

Chord class. Handling chord.

This class generates a Notes object by inputting a chord name at initialization.

from munotes import Chord
chord = Chord("A#m7")
print(chord) # A#m7
print(chord.names) # ['A#', 'C#', 'F', 'G#']

Methods are the same as Note (and Notes).
Transpose is also supported by transpose()

chord.transpose(3)
print(chord) # C#m7
print(chord.names) # ['C#', 'E', 'G#', 'B']

Track

Track class. Handling multiple Notes as a sequence.

This class is used by inputting the notes with durations at initialization.

track = mn.Track([
    mn.Note("C4", duration=1),
    mn.Note("E4", duration=1),
    mn.Note("G4", duration=1)
])

Methods are the same as other classes.
But in methods that handling waveform (render(), play(), etc), generate the waveform as sequence of notes (like: C -> E -> G).

Stream

Stream class. Handling multiple tracks.

This class is used by inputting the tracks at initialization.

track = mn.Track([
    mn.Note("C4", duration=1),
    mn.Note("E4", duration=1),
    mn.Note("G4", duration=1)
])

chords = mn.Track([
    mn.Chord("C", duration=3),
])

stream = mn.Stream([melody, chords])

Methods are the same as other classes.

Version History

0.1.0 (2022-11-12, Beta-release)

• Add Note class
• Add Chord class

1.0.0 (2023-02-09)

• Add Notes class
• Add Track class
• Add Stream class
• Add Rest class
• Add sin(), square(), sawtooth() methods
• Add play() method
• Add render() method

1.0.1 (2023-02-12)

• Fix a bug that Rest could not be put into Track.

1.1.0 (2023-02-16)

• Waveform parameters can be specified. Ex: note.sawtooth(width=0.5)
• Support for inputting octave with note names. Ex: note = mn.Note("A4")
• All supported chords can be seen in mn.chord_names
• Arbitrary chords can be added

2.0.0 (2023-11-19)

• Add Envelope class
• Modify sec argument to duration
• Add default parameters for rendering that can be specified in initialization
  • waveform
  • duration
  • unit
  • bpm
  • envelope
  • duty
  • width
  • amp
• Remove function that change frequency of A4 directly
• Modify input type of Track from Tuple[Note, float] to List[Note]
  • Note.duration is used to duration when rendering
• Remove **kwargs in render() method

2.0.1 (2023-11-20)

• Fix __add__ method of Notes class
• Fix a bug that append() method of Notes class does not work
• Modify __repr__ method

2.0.2 (2024-05-21)

• Fix a bug that chord names in Track and Stream are not update when transposed

2.0.3 (2026-07-05, Latest)

• Fix __all__ exports
• Update GitHub Pages URL