Interactive Music for the Masses
http://www.pixelsumo.com/post/josh-randall-cybersonica

Literal (pixelsumo.com):
For the Cybersonica conference, we had Josh Randall, Creative Director of Harmonix Music over to do the keynote lecture ‘Interactive Music for the Masses’.
About the talk

The video documentation is now online thanks to Playstation.com and Cybersonica.tv, highly recommended viewing.

Watch:
Lecture on Playstation.com
Josh gets interviewed by Playstation.com