Tribal Tech is an amazing cutting-edge fusion band. I must warn you, many people will not necessarily like their music. People who like jazz will say they are too metal-y, people who like metal will find them too jazzy, people who like funk will say they mess around with the beat too much, a lot of people will say they all play too many notes, and people who like pop will not understand them at all. But I love 'em.
Tribal Tech is:
Scott Henderson - electric guitar
Gary Willis - fretless bass
Kirk Covington - drums
Scott Kinsey - keyboards
I like them because to me, they are challenging the existing dimensions of music. They delve on occasion into atonal music, at one point even using a live studio audience as an instrument. Although that may be more of a joke than a "statement." Whatever. Plus they are all virtuosic on their instruments.
A slightly similar band is Liquid Tension Experiment. Although I find that LTE is actually less experimental than is Tribal Tech. They play more notes, but less musically. TT has much greater poetry in their playing than does LTE.
You can find Tribal Tech CDs and real audio previews on CDNow.