In no particular order, a few that come to mind:
”On The Waterfront” - Leonard Bernstein
”Lieutenant Kije” - Sergei Prokofiev
“L’ascenseur Pour L’Echafaud” - Miles Davis
“The Adventures of Robin Hood” - Erich Korngold
”Sunset Boulevard” - Franz Waxman
”The Good, The Bad, and The Ugly” - Ennio Morricone
The recently passed Quincy Jones deserves mention for “In The Heat Of The Night”
And since you are interested in silent films, check out Charlie Chaplin’s scores for his own films. If anything, as one more example of his genius.