The opera/Darth Plagius scene. Great music.
The Anakin/Padme bit where they look across Coruscant. No dialogue, great music.
Watto.
The bit in TPM when the Battletanks are moving across the Naboo plains.
The start of Sith up until Artoo jumps out of the fighter.
Anakin chopping off Count D's head.
Order 66.