Research on 3 Main Theme (similarities and differences) of three films in the go

Research on 3 Main Theme (similarities and differences) of three films in the golden age period, including texture, harmony,orchestration, and etc.
1933 King Kong – Max Steiner https://www.youtube.com/watch?v=wTdOjpGhvPs
Korngold – King’s Rowhttps://www.youtube.com/watch?v=QKOYgr-gWZE
The Great Escape – Elmer Bernstein https://www.youtube.com/watch?v=v5w2lixqPZM