it’s the second time we heard that track in the film (trying to reduce this kind of repetitive tracking), and second because this is the birth of Vader - let’s hear his march.
I love that I don’t know this, but when does the track appear earlier in ROTS?
When we first see the battle on Kashyyyk. It’s actually an unused cue from the arena in AOTC. I’m going to try to make it a sort of motif for the clones/clone wars in that film, if I can.