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.

## Project details

This version 1.0.2 1.0.1 1.0.0

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