The attention paid to movie scores"particularly in concert halls, where they're often played live to accompany screenings"doesn't, for the most part, serve movies any better than music. It's painful to think of musicians, expert in works from Beethoven to Boulez, sawing away for two hours at a score by John Williams (as the New York Philharmonic will be doing for screenings of "E.T." three times in May) and, for that…