Looks like it.
Classical music abandoned the public long ago, even before the end of the 19th century, going off in various strange directions that the public wasn't willing to follow. With the advent of moving pictures and especially the beginning of "talking" films with dialog, musical soundtracks became an important component of the industry, and film composers supplied the beautiful melodies that the public had been missing.
Horner is (was?) a prolific composer, with over 100 film scores to his credit, and a bunch of awards, also, including two Oscars.
Probably my favorite work of his was Braveheart.