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I am a super-lover and many-time watcher of this video because it's just so fun and instructive - we can hear the differences in vocal timbres of all the singers, and how Kaori's voice fits in that mix/ensemble setting, singing high, middle or low, and handling the different requirements of the slow or fast songs, in a high-level theatrical stage setting (
@george1234 and I were talking about Kaori's theatrical experience and how she would sing in the SIX musical show -
I don't think she would be up for their costuming, maybe if she were in her early FJ years or Elemental period).
Kaori has really been running with the big dogs for quite a while! If Revo's shows had really caught on prior to Attack on Titan she would have had a much bigger stage to shine on as a solo personality, since Revo has multiple solo songs/showcases for his singers (how I discovered Joelle too)!
It also makes me appreciate her ability, level, and stage experience and wish even more that she would have been more successful personally and SANG BIGGER SONGS
carrying her name! I guess an ensemble singer doesn't get to shine as much as a solo singer, though if you are part of a supergroup, being viral and in the public eye, and having many hits, your profile and visibility gets raised really high with the group and you get noticed more.
FJ live is a more subdued, professional vocal setting, following Kajiura's personality and vision, and so the ultimate focus is on her, not the singers, though their personalities come through a bit in the relevant MC sections, and of course while singing.