Keep in mind that the original 6-track mix is too "big" for most home theatres, and would require substantial rewiring and jiggery-pokery to duplicate in the home setting. The original 6-track mix was restored in 2010 http://in70mm.com/news/2010/wss/index.htm, but the 4-track mix (also restored) would be the preferred mix for the vast majority of HT setups.That and the inclusion of the original 6-track mix will be the deciding factors as to whether I will eventually buy a Criterion edition of West Side Story (supposing this is true).