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J.S. Zamecnik & Moving Picture Music includes an essay, notes, MIDI files and sheet music for use with silent films.

Silent movies were always accompanied by music, but they were only rarely released with an official score. Instead, the studio would send out a "cue sheet" with a list of the major scenes, the approximate length of each scene, and the title of an appropriate piece of music. The musical director at each theater could find the appropriate music and put it in order, or if their library did not include a particular piece, they would substitute something similar in mood. Many music directors ignored the cue sheets altogether, and scored each film as they saw fit.

Being a music director required a huge library with hundreds or thousands of orchestrations, and-- not foreseeing that their careers would vanish with the coming of "talkies" in 1928-- many music directors invested in such libraries. Theater orchestra arrangements of classical works were popular for film scoring, but many original compositions were also published specifically for motion picture orchestras.

-- J.S. Zamecnik and Silent Film Music, by Rodney Sauer (1998)

"Sam Fox Moving Picture Music Volume 1" by J.S. Zamecnik is probably the first music ever published for creating film scores. Several composers had created complete film scores before this time, but the usefulness of this music was limited by its being assigned to a particular picture. Most musicians, realizing that they would be playing for thousands of films, would not invest in music that was only useful for only one picture that would be gone in a week. They wanted a permanent library of useful pieces from which they could "compile" their own scores to any movie. The Sam Fox Moving Picture Music series was designed to fill this need.

-- Notes on "Sam Fox Moving Picture Music", by Rodney Sauer (1998)