Fans breach the language barrier at overseas expos of Japanese pop culture as soon as the music starts. Legions of non-Japanese, most of whose knowledge of the language is limited to basic greetings and exclamations, burst into karaoke-style singalongs, mimicking dance moves and waving glow sticks. This instant fluency lasts for about three to five minutes, then the song ends and they segue into shouts of approval in their native tongues. Rock on.