[Dark Knight]

Thanks for the challenge.

Mozart 554
Beethoven 413
Bach 394

The internet movie data base, music used by each composer in listed movies.

imdb.com

Bach was still robbed.

DK

[GSlob]

OK. Here are Murray's "qualified sources" for the Western music:
G.Abraham, (1979) The Concise Oxford History of Music, Oxford, Oxford University Press;
L. Alberti, (1968) Musica Nei Secoli, Milan, CEAM;
M.C. Bertrando-Patier, (1998) Histoire de la Musique, Paris, Larousse
E. Borroff, (1990) Music in Europe and the United States, New York, Ardsley house
C. Dahlhaus and M. Eggebrecht, (1978) Brockhaus Riemann Musiclexicon, 2 vols, Mainz, F.A.Brockhaus.
D.J.Grout and C.V.Palisca, (1996), A History of Western Music, New York, W.W. Norton &Co.
P. Hamburger (1966) Musikens Historie, Copenhagen, Aschehoug Dansk Forlag
and another 10 equally dry, equally scholarly and equally incomprehensible to a layman works. To score really high, one better be in all 16 sources, and prominently. As you can see, it has nothing to do with use in movies. Results of this "popularity contest":
Beethoven 100; Mozart 100; J. S. Bach 87; Wagner 80; Haydn 56, and all the rest of them, from Handel to Gluck - below 50.