That's so far off the mark. George Lucas completely recut the last act of TPM after the score was done and recorded. And HE didn't even bother to work with Williams to rescore and tweak the music. He just had people hack apart the cues and splice them together haphazardly with no thought for the music. This is completely evident on the TPM Ultimate Edition, which has all of the tracked in bits of Dual of the Fates, as well as all the bad edits. It showed such little respect for the music that John Williams sent Lucas a letter expressing his disappointment in how the music appeared in the film. And there were the same number of "cooks in the kitchen" for the original trilogy. Lucas directed only ANH. There were other directors for TESB and ROTJ, other producers and editors for each film. If anything, Williams' sound and plan for the score faired BETTER for TFA than for any of the Prequel films. The music was treated with more respect and presented in film in a wonderful and melodic way. I'm only aware of one place for a few seconds that music was substituted for something else entirely. Williams was actually allowed to write an end titles suite, instead of slapping in the concert arrangements of whatever and calling it good.