What if, when we first enter Coruscant and see that long shot of Valorum and Palpatine on the landing platform, instead of the exciting music we have, we have that dark monk-choir-thing from ROTS ("Palpatine's Teachings" on the soundtrack)? There are no real happy scenes that take place on Coruscant, or at least not many, and I think having a darker-toned introduction to Coruscant, the place where all of the galaxy's screwing-over comes from, might make it more serious. Especially since our heroes are going there because of a dire situation in the first place.