Primus got me interested in creating MIDI chords in Perl. So I started researching and this is what I came up with. The BASE_NOTE can be attained in different ways depending on which module you are using. See the example.

Update: NOTE: This only creates the note values. It does not play them.

use MIDI; # for example usage
my %chords = (
    major   => [0, 4, 7, 12],
    minor   => [0, 3, 7, 12],
    major7  => [0, 4, 7, 11],
    minor7  => [0, 3, 7, 10],
    minor75 => [0, 3, 6, 10],
    dim     => [0, 3, 6, 9],
    dom7    => [0, 4, 7, 10],
    major9  => [0, 4, 7, 11, 14],
    minor9  => [0, 3, 7, 10, 14],
);

my $note = 'Cs5'; # C sharp, 5th octave
my $base = $MIDI::note2number{$note}; # 61
my @CsMajor5 = chord($base, @{$chords{major}});
print "C sharp major chord, 5th octave: @CsMajor5\n";
# output: C sharp major chord, 5th octave: 61 65 68 73

sub chord {
# BASE_NOTE is the numeric value of the first note
# CHORD is a chord array
  my ($base, @chord) = @_;
  return map { $_ += $base; } @chord;
}

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In reply to Chord Values for MIDI by Mr. Muskrat

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