Linda Holmes on Monkey See:
This was brought home to me this weekend when I checked out a digital download of When Harry Met Sally that I got through Amazon. While some of the standards from the soundtrack survive — they appear to have been able to line up the Ella Fitzgerald/Louis Armstrong stuff — much of the rest of the music is substantially different, including just about everything that accompanies the last ten or twelve minutes of the movie.
Some soundtracks are so intrinsically part of the film – think of Quentin Tarantino films, for example – it’s never occurred to me that issues with rights clearance can lead to the music being replaced.
(Now updated so post title links to the article.)