I can't believe that I'm actually saying this but remember a time when film music had themes? I miss themes and long for the days when film music could stand alone without the visuals. I think themes began to die out during the 90's with the advent of the documentary film style that became popular with the "found footage" genre and all of it's derivatives. This was especially prevelant in TV scoring. Beautifully constructed themes just weren't a good fit to the shaky camera and awkward zoom in/out and rak focusing techniques in vogue at the time. I guess Taiko thuds, block chords and arpeggiators are more appropriate scoring as if a raw "score" syncs better then a developed and polished one. Not that I necessary agree with that but now we get back to "cultured" or lack thereof.
I find what William mentioned about the intruduction of Pop/Rock styles during the 1960s very interesting. I've always had mixed feelings about Pop music used in place of the established scores. But to build on William's point, Pop scores aren't just lazy they're cheap attempts by studios to sell tickets or CD's or downloads or all the above. Not to mention the need to promote yet another diva/rock band on to the music scene. As usual, it's all about the money. I could go on and on with a list of films scored with completely inapropriate Pop songs created solely for ticket and record sales.
However, in some cases, Pop music just may be the best fit for a film. I admire Williams' work immensely and he has never disapointed me but I'm not sure a Williams' score would have had the same effect on a film like Goodfellas that the montage of carefully selected Pop songs did. Goodfellas had absolutely no original music whatsoever. Not even incidental music.
Also, scores completed in a Pop or Pop hybrid style can be refreshing at times. I know many forumites role their eyes when I mention this but Giorgio Moredor's score for Scarface is still one of my all-time favorites. But, in this case, Moredor wrote those Pop songs specifically for the movie and they were not tailored for a mass market or to propel the career of a diva.