/ 
Music-Cadence-0.0601
River stage one • 1 direct dependent • 1 total dependent
/ Music::Cadence

NAME

Music::Cadence - Provide musical cadence chords

VERSION

version 0.0601

SYNOPSIS

use Music::Cadence;

my $mc = Music::Cadence->new;

my $chords = $mc->cadence( type => 'perfect' );
# [['G','B','D'], ['C','E','G']]

$mc = Music::Cadence->new( octave => 4 );

$chords = $mc->cadence( type => 'perfect' );
# [['G4','B4','D4'], ['C4','E4','G4']]

$chords = $mc->cadence(
  type    => 'half',
  leading => 2,
  octave  => 0,
); # [['D','F','A'], ['G','B','D']]

$mc = Music::Cadence->new(
  key    => 'C#',
  octave => 5,
);

$chords = $mc->cadence( type => 'perfect' );
# [['G#5','C5','D#5'], ['C#5','F5','G#5']]

$mc = Music::Cadence->new(
  key    => 'C#',
  octave => 5,
  format => 'midi',
);

$chords = $mc->cadence( type => 'perfect' );
# [['Gs5','C5','Ds5'], ['Cs5','F5','Gs5']]

$mc = Music::Cadence->new(
  key    => 'C',
  octave => 4,
  format => 'midinum',
);

$chords = $mc->cadence( type => 'perfect' );
# [[67,71,62], [60,64,67]]

DESCRIPTION

Music::Cadence provides musical cadence chords.

* This module is a naive implementation of the actual theory. YMMV. Patches welcome.

ATTRIBUTES

key

The key or tonal center to use. Default: C

Examples: G#, Eb

scale

The scale to use. Default: major

Supported scales are:

ionian / major
dorian
phrygian
lydian
mixolydian
aeolian / minor
locrian

octave

The octave to either append to named chord notes (for midi or isobase format) or to determine the correct midinum note number.

Default: 0

If the format is midi or isobase, setting this to 0 means "do not append."

The midinum range for this attribute is from -1 to 10.

format

The output format to use. Default: isobase (i.e. "bare note names")

If midi, convert sharp # to s and flat b to f after chord generation.

If midinum, convert notes to their numerical MIDI equivalents.

METHODS

new

$mc = Music::Cadence->new;  # Use defaults

$mc = Music::Cadence->new(  # Override defaults
  key    => $key,
  scale  => $scale,
  octave => $octave,
  format => $format,
);

Create a new Music::Cadence object.

cadence

$chords = $mc->cadence;     # Use defaults

$chords = $mc->cadence(     # Override defaults
  key       => $key,        # Default: C
  scale     => $scale,      # Default: major
  octave    => $octave,     # Default: 0
  type      => $type,       # Default: perfect
  leading   => $leading,    # Default: 1
  variation => $variation,  # Default: 1
);

Return an array reference of the chords of the cadence type based on the given key and scale name.

The octave is optional and if given, should be a number greater than or equal to zero.

The variation applies to the deceptive cadence and determines the final chord. If given as 1, the vi chord is used. If given as 2, the IV chord is used.

Supported cadences are:

perfect
half
plagal
deceptive

The leading chord is a number (1-7) for each diatonic scale chord to use for the first half cadence chord. For the key of C major this is:

CM: 1
Dm: 2
Em: 3
FM: 4
GM: 5
Am: 6
Bo: 7

SEE ALSO

The eg/cadence and t/01-methods.t files in this distribution.

Moo

Music::Chord::Note

Music::Note

Music::Scales

Music::ToRoman

https://en.wikipedia.org/wiki/Cadence

https://www.musictheoryacademy.com/how-to-read-sheet-music/cadences/

TO DO

Use Music::Chord::Positions!

Evaded cadence

Imperfect cadences

AUTHOR

Gene Boggs <gene@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2019 by Gene Boggs.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.