What is his most recent 'brilliant' composition

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"The People's House" from Lincoln. An excellent theme, and great orchestration.

The Book Thief album is consistently good, and often great, but it isn't too far off from some of William's other works, like Angela's Ashes or Presumed Innocent.

The Book Thief has one of the greatest compositions from the Maestro:

New Parents and a new home



War Horse is completely magnificent.

"The Homecoming" end credit suite from War Horse - https://www.youtube.com/watch?v=PdzaRwcCc38

I'm confident there will be something from Star Wars 7 to qualify as well.

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If John Williams Scored Harry Potter 4-8: https://www.youtube.com/playlist?list=PL6HqJLDCy3kZodnQ-NNewovSKPU4Q1dm4

Well, now it's Rey's Theme.

Agreed.

Rey's Theme!

Definitely Rey's Theme on the Force Awakens. His best score since Star Wars Episode II's Across the Stars.

https://www.youtube.com/watch?v=65As1V0vQDM