It's Yoko.
Here's a list of stuff she's worked on:
Anime:
Brain Powered
Card Captor Sakura
Chikyuu Shoujo Arjuna
Clamp School Detectives
Cowboy Bebop
Jin Roh
Legend of Crystania
Macross Dynamite Seven
Macross Plus
Please Save My Earth
Record of Lodoss War
Turn-A-Gundam
Vision of Escaflowne
X
Videogames:
Napple Tale
Nobunaga's Ambition
And a few other game STs, and other stuff...
Here's a great Yoko Kanno site.
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