MIDI::Filespec -- MIDI File Specification
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Look around https://www.midi.org/specifications to get a copy of the MIDI File Format specification.
To install MIDI, copy and paste the appropriate command in to your terminal.
cpanm
cpanm MIDI
CPAN shell
perl -MCPAN -e shell install MIDI
For more information on module installation, please visit the detailed CPAN module installation guide.