Seiji, I love almost every note of the prequel music, but feel it has suffered as a direct result of the way the new movies went through post-production. In the past, Williams was effectively able to write music to match the image because the cut would be almost locked when the scoring sessions came up. Some of the effects might not be polished at that point, but the pace and everything else were pretty much set. Now, Lucas and his crew are able (and liable) to make significant changes in the editing of a scene almost until the day that prints have to be struck. The score still has to be written and recorded a few months before the film's release, and Williams often had a rougher cut to compose to, particularly for the action sequences. The music he wrote is still, IMO, very good and improves with each passing prequel, but with sequences getting re-edited in the late going and music from other scenes (or even other movies) getting dropped in to try and cover the tracks, the prequel scores often don't work as well in the context of the movie as in the OT.