Guandao
Rajah of Minyue, Hlai and Langkasuka
Just for Japan. It fits modern Japan very well. Still conservatively traditional in many areas but with large influence from western cultures particularly the US, UK, and Germany. They aren't in the video but they also have members that play the traditional flute, the horizontal harp, and a singer.
I agree that it would've been cool if Geoff Knorr worked with them to produce the Japanese themes.