Sources for the romanization of 江里口奏子 (
1,
2). Btw, that's her
blog and although she gives her name as Souko, I've preferred to put her name as Soko as it appears in the aforementioned flyers.
I've fixed the credit of the percussion player (previously incomplete as 井珠緒) to Tamao Fujii. And about 荻原顕彰, I don't have anything concrete yet, but this
Akira Ogiwara may be this artist (horn player) since he has a lot of rated videos of brass instruments performances.