Photoplay music is incidental music, soundtrack music, and themes written specifically for the accompaniment of silent films.
A typical cue sheet. This example is Ernst Luz's compilation for London After Midnight (1927), as published by Cameo Thematic Music, Inc.
A silent film is a film without synchronized recorded sound. Though silent films convey narrative and emotion visually, various plot elements or key lines of dialogue may, when necessary, be conveyed
Photoplay music
…Photoplay music is incidental music, soundtrack music, and themes written specifically for the accompaniment of silent films. Early films (c. 1890–1910) merely relied on classical and popular repertory, mixed usually with improvisation by whatever accompanist was playing…
A still from 1921's The Four Horsemen of the Apocalypse, one of the highest-grossing silent films
Aziza Amir in Laila (1927)
The Cabinet of Dr. Caligari (1920) used stylized inter-titles.
Lillian Gish, the "First Lady of the American Cinema", was a leading star in the silent era with one of the longest careers—1912 to 1987.