NAME

Music::Cadence - Provide musical cadence chords

VERSION

version 0.0500

SYNOPSIS

  use Music::Cadence;

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

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

  my $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,
    format => 'midi',
  );

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

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 append to chord notes. Default: 0 meaning "do not append."

format

If midi, convert sharp # to s and b to f after chord generation. Default: '' (none)

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::Scales

Music::ToRoman

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

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

TO DO

Evaded cadence

Imperfect cadence

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.