I would have loved that. But since the guy who wrote their songs passed away, I understand why ANet wouldn't do something like that.
Just for the record, Stan LePard, the person who passed away a few years ago, did not write the Metal Legion songs. That was Joseph Clark, who is still at ArenaNet. Stan wrote some ambient and combat music for a couple of those content updates, in addition to his many years of work on the game as composer and orchestrator prior to that.
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