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In 2006, Slovenian band Laibach released an album of national anthems called "Volk". It includes a seven minute version of Kimigayo sung in Japanese and English. You can hear the album recording via this YouTube link or watch the live performance in the clip above. They are still touring with the album now but the band have never visited Tokyo and it isn't on the current itinerary so the question of whether they would face protests if they tried to perform it in Japan is moot.