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whatkind Added
Regarding Koukin, I didn't check the album for that role and thought you wanted 口琴 added, so I added that to Harmonica since Google and Wikipedia told me that's what it was. Turns out I ended up on Chinese Wikipedia. Though it isn't relevant to your requests, I just felt like pointing out there's some discussion going on regarding 口琴 in regards to being used both in Japanese on Jew's Harp and Chinese on Harmonica. This might become important in the future.
Sorry about all the missed roles each time. I'm usually very busy on Sunday, so I guess it was hard to focus.
EDIT: Haha, I see you checked in again while I was adding them. Is Strings Musicians Coordination still not working for you?
EDIT2: Found the problem, I entered it as Strings Musicians Coordination by accident.
EDIT3: OK, so it also changes the display here in the forums. Basically, I put two spaces between Strings and Musicians instead of one. This gets displayed as just one space.