John Williams stuff all sounds the same because it's what's needed for the movie. He's quite capable of writing different, unfamiliar stuff. The Star Wars Cantina and The Terminal are nothing like Indiana Jones or Jurassic Park.
People take what Spielberg wants his blockbusters to sound like, and assume it's John Williams showing a lack of ability and talent. They don't stop to think that maybe he's doing what he's paid to do and give the director what he wants.
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