Miki Higashino (Mainly known for Suikoden, probably my single favorite, even including the others on this list who I absolutely smurfing adore. If I was Emperor of Earth I would have her compose our anthem and marching themes.)
https://www.youtube.com/watch?v=e7CKWhNB4Es
https://www.youtube.com/watch?v=OzGAcmUrBeM
https://www.youtube.com/watch?v=gTGJA5CYWp8 (Happiest track ever)
https://www.youtube.com/watch?v=HBEk9uCJISw

Yoshino Aoki and Akari Kaidi (BoF games never have shortcomings in their music but BoF 3 has basically one of the best OSTs ever and I could link pretty much every single song in the game oh my god)
https://www.youtube.com/watch?v=Lc_K1V271UM
https://www.youtube.com/watch?v=5jxPCMTxMQo
https://www.youtube.com/watch?v=Kfm8AHLXJWE

nervous_testpilot
https://www.youtube.com/watch?v=DB_jczxh7bE
https://www.youtube.com/watch?v=uprBLCY4UaQ

Alexander Brandon, Michiel van den Bos and Dan Gardopee because they were responsible for the Deus Ex soundtrack which is essentially perfect from start to finish
https://www.youtube.com/watch?v=FnYwLZcxOtY
https://www.youtube.com/watch?v=9FZ-12a3dTI

Jeremy Soule
https://www.youtube.com/watch?v=ZWuNf4gxwuM

edit; I overlooked them at first but basically everyone at Blizzard does some great work, and always has;

https://www.youtube.com/watch?v=khff4ZIJNeU
https://www.youtube.com/watch?v=1waVSu4adDM (Only an excerpt, but without hyperbole the greatest piece of music ever written)
https://www.youtube.com/watch?v=AIGROVO4wUg