Music::Duration::Partition - Partition a musical duration into rhythmic phrases
version 0.0704
use MIDI::Simple (); use Music::Duration::Partition; use Music::Scales; my $mdp = Music::Duration::Partition->new( size => 8, # 2 measures in 4/4 time pool => [qw(hn dqn qn en)], ); $mdp->pool_select(sub { ... }); # Optional my $motif = $mdp->motif; my @scale = get_scale_MIDI('C', 4, 'major'); my $score = MIDI::Simple->new_score; for my $n (0 .. 31) { # 4 loops over the motif $score->n($motif->[$n % @$motif], $scale[int rand @scale]); } $score->write_score('motif.mid'); # The pool may also be made of duration ticks $mdp = Music::Duration::Partition->new( size => 100, pool => [qw(d50 d25)], weights => [0.7, 0.3], # Optional ); # The pool may also be grouped $mdp = Music::Duration::Partition->new( pool => [qw(hn qn tqn)], groups => [0, 0, 3], # Optional );
A Music::Duration::Partition divides a musical duration given by size, into rhythmic phrases of smaller durations drawn from the pool.
Music::Duration::Partition
For example, to generate a measure in 5/4 time, set size equal to 5 and set the pool to an array-reference of MIDI::Simple durations whose lengths are less than or equal to 5 quarter notes.
5/4
5
To generate a measure in 5/8 time, set size equal to 2.5 (meaning 5 eighth notes).
5/8
2.5
$durations = $mdp->durations;
A hash reference of duration lengths (keyed by duration name).
Default: \%MIDI::Simple::Length
\%MIDI::Simple::Length
$size = $mdp->size;
The value, in quarter notes, of the duration to partition.
Default: 4
4
$pool = $mdp->pool;
The list of possible note durations to use in constructing a rhythmic motif.
Default: [ keys %MIDI::Simple::Length ] (wn, hn, qn, ...)
[ keys %MIDI::Simple::Length ]
This can be either a list of duration names, as in the example, or duration values, specified with a preceding 'd'. A mixture of both is not well defined. YMMV
$code = $mdp->pool_select->(); $mdp->pool_select( sub { ... } );
A code reference used to select an item from the given duration pool.
Default: Random item from pool
$weights = $mdp->weights;
Specification of the frequency of pool item selection.
The number of weights must equal the number of pool entries. The weights do not have to sum to 1 and can be any relative numbers.
Default: Equal probability for each pool entry
$groups = $mdp->groups;
An array reference of entries that represent the number of times that a pool item is selected in sequence.
The number of groups must equal the number of pool entries.
Default: Zero for each pool entry
* Zero and one mean the same thing for grouping. So if needed, an entry should have a value greater than one.
$remainder = $mdp->remainder;
Append any remaining duration ticks to the end of the motif.
Default: 1 Yes. Make it so.
1
$verbose = $mdp->verbose;
Show the progress of the motif method.
Default: 0
0
$mdp = Music::Duration::Partition->new(%arguments);
Create a new Music::Duration::Partition object.
$motif = $mdp->motif;
Generate a rhythmic phrase of the given size.
This method returns a possibly different rhythmic motif each time it is called.
The default pool_select used constructs this by selecting a pool duration at random, that fits into the size remaining after each application, in a loop until the size is met.
The eg/* and t/01-methods.t programs in this distribution.
List::Util
Math::Random::Discrete
MIDI::Simple
Moo
Gene Boggs <gene@cpan.org>
This software is copyright (c) 2022 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::Duration::Partition, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Music::Duration::Partition
CPAN shell
perl -MCPAN -e shell install Music::Duration::Partition
For more information on module installation, please visit the detailed CPAN module installation guide.