Final answer:
John Williams is known for creating 'heroic and epic themes' in his music for the Star Wars movies, with full orchestration and iconic leitmotifs like the 'Imperial March' and the 'Main Theme'.
Step-by-step explanation:
The common features of the music developed by John Williams for all the Star Wars movies are heroic and epic themes. John Williams is renowned for his skill in developing memorable, lavish scores that enhance the grandeur and adventure found in the Star Wars saga. His music is known for its use of leitmotifs, which are recurring musical phrases associated with specific characters or themes within the films.
For instance, the well-known 'Imperial March' is associated with Darth Vader and the Galactic Empire, while the 'Main Theme' is identified with the heroic journey throughout the series.
Williams' compositions for Star Wars are characterized by their full orchestration, complex arrangements, and the emotional breadth that adds to the storytelling and cinematic experience.