Thanks John Randolph, do you have entire movie of this edition? Why it wasn't still published? No better opportunity than this about Lenny's 100th Anniversary!
It's a website that carries a lot of live performances on DVD and CD: www.premiereopera.com/search.aspx?find=bernstein+quiet+place&log=false&category=2
I've never heard a string on any instrument make that noise when it snapped! It was probably something electrical, it even made Bernstein flinch. As far as the brass are concerned, they are not the best, but out of tune, no. The standard of this recording is very poor and doesn't help anyone.