/ 
Music-Cadence-0.0801
/ Music::Cadence

NAME

Music::Cadence - Provide musical cadence chords

VERSION

version 0.0801

SYNOPSIS

use Music::Cadence;

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

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

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

$chords = $mc->cadence( type => 'perfect' );
# [['G4','B4','D4'], ['C4','E4','G4','C5']]

$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','C#6']]

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

$chords = $mc->cadence( type => 'perfect' );
# [['Gs5','C5','Ds5'], ['Cs5','F5','Gs5','Cs6']]

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

$chords = $mc->cadence( type => 'perfect' );
# [[67,71,62], [60,64,67,72]]

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 variation applies to the deceptive and imperfect cadences.

If the type is deceptive, the variation determines the final chord: For 1, the vi chord is used. For 2, the IV chord is used.

If the type is imperfect, the variation determines the kind of cadence generated. For 1, a perfect cadence is rendered but the highest voice is not the tonic. For 3, a perfect cadence is rendered but (in a major key) the V chord is replaced with the vii diminished chord.

Supported cadences are:

perfect
imperfect
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

Evaded cadence

Imperfect inverted cadence (2nd variation)

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.