it's not specific for this instrumentation, but i'm wondering now is how would sound a version of In C by riley with 8 hands?
Does anyone know any music for 4 pianos played by any (feasible!) number of pianists? And is any of it actually worth playing?
Rimsky-Korsakov's "Flight of the Bumblebee" for 8 pianos (arr. by First Piano Quartet).
I actually have a recording of that for 6 pianos, 12 hands, along with Reich's "6 Pianos".