Query: a trip to the moon and new soundtracks

From: jeffrey masko <[email protected]>

The French electronic duo, Air, has done a new soundtrack
(
http://www.huffingtonpost.com/2012/01/05/airs-sonic-le-voyage-dans-la-lune_n_1186492.html
).
I'm curious what folks think about writing new scores for silent films,
especially when they use instrumentation that did not exist when the film
was first scored? *Man with a Movie Camera *comes to mind; I find some of
the newer soundtracks quite effective and others distracting. How are
decisions made in choosing who or what type of soundtrack is to be recorded
in these restorations?