Music::Chord::Progression - Create network transition chord progressions
version 0.0609
use Music::Chord::Progression; use MIDI::Util qw(setup_score midi_format); my $prog = Music::Chord::Progression->new; my $chord_type = $prog->substitution('m'); # m7 or mM7 my $progression = $prog->generate; my $score = setup_score(); for my $chord (@$progression) { $score->n('wn', midi_format(@$chord)); }
Music::Chord::Progression creates network transition chord progressions.
Music::Chord::Progression
This module can also perform limited jazz chord substitutions, if requested in the constructor.
The number of chords to generate in a phrase.
Default: 8
8
The network transitions between chords of the progression.
The keys must start with 1 and be contiguous to the end.
1
Ending on 12 keys all the notes of the chromatic scale. Ending on 7 represents diatonic notes, given the scale_name.
12
7
If you do not wish a scale note to be chosen, include it among the keys, but do not refer to it and do not give it any neighbors. Thus, in the first example, the 7th degree of the scale will never be chosen.
Default:
{ 1 => [qw( 1 2 3 4 5 6 )], 2 => [qw( 3 4 5 )], 3 => [qw( 1 2 4 6 )], 4 => [qw( 1 3 5 6 )], 5 => [qw( 1 4 6 )], 6 => [qw( 1 2 4 5 )], 7 => [] }
A contrived chromatic example where each note connects to every note:
{ 1 => [1 .. 12], 2 => [1 .. 12], 3 => [1 .. 12], 4 => [1 .. 12], 5 => [1 .. 12], 6 => [1 .. 12], 7 => [1 .. 12], 8 => [1 .. 12], 9 => [1 .. 12], 10 => [1 .. 12], 11 => [1 .. 12], 12 => [1 .. 12], }
The chord names of each scale position.
The number of items in this list must be equal to the number of keys in the net.
Default: [ '', 'm', 'm', '', '', 'm', 'dim' ] (major scale)
[ '', 'm', 'm', '', '', 'm', 'dim' ]
Here '' refers to the major chord and 'm' means minor.
''
'm'
Here are the known chord mappings:
chromatic => [ ('m') x 12 ], major => [ '', 'm', 'm', '', '', 'm', 'dim' ], ionian => [ '', 'm', 'm', '', '', 'm', 'dim' ], dorian => [ 'm', 'm', '', '', 'm', 'dim', '' ], phrygian => [ 'm', '', '', 'm', 'dim', '', 'm' ], lydian => [ '', '', 'm', 'dim', '', 'm', 'm' ], mixolydian => [ '', 'm', 'dim', '', 'm', 'm', '' ], minor => [ 'm', 'dim', '', 'm', 'm', '', '' ], aeolian => [ 'm', 'dim', '', 'm', 'm', '', '' ], locrian => [ 'dim', '', 'm', 'm', '', '', 'm' ],
If chord_map is not defined and a known scale_name is given to the constructor, the corresponding chord_map above, will be used.
Alternative example:
[ 'M7', 'm7', 'm7', 'M7', '7', 'm7', 'dim7' ]
The known chord names are listed in the source of Music::Chord::Note.
The name of the scale.
Default: major
major
Please see "SCALES" in Music::Scales for the allowed scale names.
The (uppercase) name of the scale starting note with an optional # or b accidental.
#
b
Default: C
C
The scale notes. This is a computed attribute.
Default: [C D E F G A B]
[C D E F G A B]
The octave of the scale.
Default: 4
4
Set the start of the progression.
If this is given as 1 the tonic chord starts the progression. If given as 0 a neighbor of the tonic is chosen. If given as -1 a random net key is chosen.
0
-1
Default: 1
Set the end of the progression.
If this is given as 1 the tonic chord ends the progression. If given as 0 a neighbor of the last chord is chosen. If given as -1 a random net key is chosen.
Perform jazz chord substitution.
Default: 0
Rules:
The subroutine to determine if a chord substitution should happen.
Default: sub { int rand 4 == 0 } (25% of the time)
sub { int rand 4 == 0 }
Use flats instead of sharps in the generated chords.
The network transition Graph object. This is a computed attribute.
Default: Graph::Directed->new
Graph::Directed->new
The generated phrase of named chords. This is a computed attribute.
The generated phrase of individual note chords. This is a computed attribute.
Show the progress and chosen values.
$prog = Music::Chord::Progression->new; # Use the defaults $prog = Music::Chord::Progression->new( # Override the defaults max => 4, net => { 1 => [...], ... 7 => [...] }, chord_map => ['m','dim','','m','m','',''], scale_name => 'minor', scale_note => 'A', octave => 5, tonic => 0, resolve => -1, flat => 1, substitute => 1, verbose => 1, );
Create a new Music::Chord::Progression object.
$chords = $prog->generate;
Generate a fresh chord progression and set the phrase and chords attributes.
$substitute = $prog->substitution($chord_type);
Perform a jazz substitution on the given the chord type.
The t/01-methods.t test and eg/* example files
Carp
Data::Dumper::Compact
Graph
Moo
Music::Chord::Note
Music::Scales
Gene Boggs <gene@cpan.org>
This software is copyright (c) 2020-2023 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.
To install Music::Chord::Progression, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Music::Chord::Progression
CPAN shell
perl -MCPAN -e shell install Music::Chord::Progression
For more information on module installation, please visit the detailed CPAN module installation guide.