Here's another mystery:

perl -MExtUtils::Installed -le 'print join "\n", grep /midi/i, ExtUtils::Installed->modules()'

MIDI-Perl
MIDI::Ngram
MIDI::Pitch
MIDI::Praxis::Variation
MIDI::Simple::Drummer
MIDI::Tab
MIDI::Trans

perl -MExtUtils::Installed -le 'print join "\n", ExtUtils::Installed->files("MIDI-Perl")'

/perl-5.26.2/lib/site_perl/5.26.2/MIDI.pm
13 more files...

perl -MModule::Metadata -MData::Dumper -le 'print(Dumper(Module::Metadata->new_from_module("MIDI-Perl")))'

$VAR1 = undef;

perl -MModule::Metadata -MData::Dumper -le 'print(Dumper(Module::Metadata->new_from_module("MIDI")))'

$VAR1 = bless( {
                 'module' => 'MIDI',
                 'filename' => '/perl-5.26.2/lib/site_perl/5.26.2/MIDI.pm',