Sure, but you have to use keys instead of each:

my $gah = join ('', map {"$_ = $hash{$_}<br>"} keys %hash);
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I moved the <br> inside the map so that each pair will get one - put it back where you had it if you do not want a <br> tag on the last pair.

jeffa

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)