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Simple arithmetic on musical notes

Project description

This module provides representations for musical notes and intervals in the basic 12-note even tempered system that is typically used in western music. It provides basic arithmetic and conversion to and from midi numbers.

Classes, Functions and Definitions

This module provides the following classes:

Note: represents a musical note

Interval: represents the interval between two notes

It also provides the following utility functions:

get_midi_number(note_string) -> midi number

in_chord(note, root, chord) -> boolean

The following intervals are predefined:

P1 = unison = Interval(0)
m2 = semitone = Interval(1)
M2 = Interval(2)
m3 = Interval(3)
M3 = Interval(4)
P4 = Interval(5)
aug4 = dim5 = Interval(6)
P5 = Interval(7)
m6 = Interval(8)
M6 = Interval(9)
m7 = Interval(10)
M7 = Interval(11)
P8 = octave = Interval(12)

The following chord types are predefined:

MAJOR = (unison, M3, P5)
MINOR = (unison, m3, P5)
SEVENTH = (unison, M3, P5, m7)

Examples

Some examples of use:

>>> Note('c') - Note('a-2')
Interval(16)
>>> Note('c') + M3
Note(64)
>>> (Note('c3') + P5).get_note_string()
'G3'
>>> in_chord(Note('c5'), Note('a'), MINOR)
True
>>> in_chord(Note('c5'), Note('a'), MAJOR)
False

Installing

To install pyscales, use pip install pyscales.

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