Being about as musical as a brick, I can't comment about how you transpose the notes. I do think you'd be better off setting up the array first and then deriving the hash from it rather than the other way around; it saves you having to sort. The no warnings qw{ qw }; is to silence warnings where Perl thinks we are trying to put comments inside a qw{ ... } list.
knoppix@Microknoppix:~$ perl -Mstrict -MData::Dumper -wE '
> my @notesArr = do {
> no warnings qw{ qw };
> qw{ A A# B C C# D D# E F F# G G# };
> };
> my $value = 0;
> my %notesHash = map { $_ => $value ++ } @notesArr;
> print Data::Dumper->Dumpxs(
> [ \ @notesArr, \ %notesHash ],
> [ qw{ *notesArr *notesHash } ]
> );'
@notesArr = (
'A',
'A#',
'B',
'C',
'C#',
'D',
'D#',
'E',
'F',
'F#',
'G',
'G#'
);
%notesHash = (
'F' => 8,
'A' => 0,
'A#' => 1,
'C#' => 4,
'E' => 7,
'B' => 2,
'D#' => 6,
'C' => 3,
'D' => 5,
'G#' => 11,
'F#' => 9,
'G' => 10
);
knoppix@Microknoppix:~$
I hope this is of interest.
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