Machines Playing Music (Not Making!)

with ref. to Mark Spearce (composer - classical music)
For a regimented form of music like classical music, where the musicians are essentially expected to reproduce exactly what is written on the music-sheet, I think that it would be apt to have computers play the instruments.
Something on the lines of the automatic-piano, which plays the piano depending upon your programming for the piece - more like a robot being programmed to play a real piano - as opposed to digital music where a computer creates the sounds.
I guess sooner or later, Classical music orchestras would be replaced by robots/computers playing all the musical instruments - precisely and exactly like how the composer intended.
Interesting how Mark dimply hated the idea of computers making music - he however was referring to computers "composing" music, as opposed to just playing!