Saw Michael Tilson Thomas 'conduct' "Renga" tonight. Very interesting and entertaining, including narration throughout by Tim Robbins of the "Lecture on Nothing". Pretty hard to explain the structure of this piece, but there were musicians spread beyond the stage into the seating areas and there was a multi-media component consisting of 50s-era film clips and commercials. A featured performer was someone playing "amplified cactus" (which sounded great, btw).
An in-depth description can be found in the program notes here: CAGE: Renga