Hancock did much to help promote the interoperability of keyboard controllers and synths, and the MIDI standard.
Roland makes some of the neatest stuff, but is still could be much better.
Here is the main link:
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Hancock is one of the few who really explores how far keyboards can go in contemporary music.
I'm really loving this. Jazz is very open music. This kind is more for watching than just for listening. How much better if the video could have smooth motion, and if you could have many video tracks, so you could have close ups of each musican and watch their fingers.