Looks like I'm the only one who reads staff rolls in games or that cares about this stuff.
Falcom Sound Team jdk (From Ys Seven - Hayato Sonoda, Takahiro Unisuga, Saki Momiyama and Masanori Osaki) are the composers of Falcom games, not the jdk Band. They just perform music for arrange albums and recently some in-game tracks. Heck, of all these battle tracks they only performed Vacant Interference -- they have nothing to do with the rest since those were done with synthetizers instead real instruments.
Sorry if I sound rude or something, as you did a great job with the video, but I hate when people praise the "jdk Band" and people like Jindo & co when they DIDN'T compose all that music but rather arrange and perform SOME of it.