SEGA going to record the national anthem of the Valkyria: Azure Revolution (PS4 / PS Vita) on October 8, 2016 in Japan.
To record the song and the video, SEGA looking for 50 participants and you can sign-up for the event from today.
SEGA going to choose the participants with a lottery choose event and they will be informed about the details via e-mail. The event will be held by the way in Tokyo in Shinjuku but the details will be published later in September / October.
If you are interested in it, you can sign-up for the event from here until September 27, 2016! http://portal.valkyria.jp/azure/cp/song/