Is Film Music Art or Just Low-Brow Commercial Fluff?

close up microphone in front of an audience
Is any music that is created for a purpose, other than that of it's own existence, art? Is film music art, or theatre music, or advert music, or music that appears on a CD-Rom presentation, or accompanying a website promo film, or music on a trailer? Even if the music's primary purpose is purely commercial - to sell that product or promote another - does that preclude its intrinsic value as art?