Spotted again this year: The unidentified carolling man. His mission: To brighten up the holiday commute. (YouTube user dreamcity4life)

Last year, Metro hosted a flash mob and a group of carolers singing ”Silent Night.” And for the past several years, train passengers have been graced by the presence of an unidentified Korean man who darts in and out of the cars belting out Christmas carols. (TBD wrote up a full report on him during a recent sighting, but riders have been documenting his appearance since at least 2006. He’s like a holiday-themed Bigfoot.)

Anyone know who he is? Videos from him and other musical Metro riders are after the jump:

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