[XISMZERO]

"Harem Beat" undoubtedly derives inspiration from T-Square's "Bad Moon".

The credits are a tad frustrating but a pair of good ears can pick up on some of Hosoe and crew's regular players on guitar, bass. I'm guessing Hiroshi Kabori handled most of the acoustic and jazzier guitar rhythms and leads (Move, Coolman Rosso, BIRI BIRI) while Katsumi Yoshihara has most signature sound (Ancient Zone, Matador). Historically, Keiichi Shirashi, who plays a lot of slap (bass) has played with Yoshihara, they likely play on the same tracks.

Not surprising, the EX series has always had a tinge of jazz-fusion that's leaked into the series sound from the beginning.