solo
-Chihiro Yamanaka
-Hiromi Uehara
-Monday Michiru
-Kaori Kobayashi (if you like that 'quiet storm' type of ish)
-dorlis
-Aiko Okumura (if you can find anything by her)
-bird

bands
-Jabberloop
-PE'Z
-Indigo Jam Unit
-quazimode
-Soil & PIMP
-J.A.M.
-Black Bottom Brass Band
-Shibusashirazu Orchestra
-Mouse on Keys (if you like the really heavy shit)

and groups w/ vocalists
-Orange Pekoe
-Jill-Decoy Association
-Paris Match
-Ego Wrappin'
-Tokyo Jihen (they're a jazz-ish rock band. their album Adult is probably the most jazzy)
-Roller Coaster (korean, but still worth checking out)
-Scoobie Do

and don't sleep on Yuji Ohno just because his main body of work is Lupin III. he has many many albums