Luc Ferrari, Compose Composite (1963) 

for a modest sized orchestra of 21 players directed by Charles Bruck, with a short electronic interlude played off tape. This is one of the variations from the famous "Concert Collectif" of the 'Philips prospective 21* siecle' series. It is avant-garde, being experimental for its time, commissioned by the O.R.T.F.
I have uploaded another of the variations: Francois-Bernard Mache's "Synergies" from the same French LP purchased in 1968. (more available on request, but regret some disc surface noise)