Berio sees the piece, which can already be counted among the "epoch-making" compositions of the second half of the 20th century, as "a journey through a variety of roles and relationships, functions and processes, during which each of the two pianos returns more often, to check paths that have already been followed, but to do each step anew with a different outlook ". The present edition is primarily intended for the pianists to study the work and contains the parts of the two solo pianos and those of the orchestral piano.

2-Piano Reduction with reduction of orchestra