use CGI::Pretty qw(ol li);

my $string = "yadda\n[yadda\nyadda]yadda\n";

$string =~ s/\[\s*([^\]]+)\]/ol li[split "\n+",$1]/eg;
[download]

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

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