Yes Will, Holiday Inn is correct. It's the scene at the end of the picture where Bing Crosby (as Jim Hardy) visits the movie studio set in Hollywood where the girl he loves, Marjorie Reynolds (as Linda Mason), is filming a movie about the inn that Bing started in Connecticut.

It's kind of a "movie inside a movie," because that set at the end of the picture is the same set where the earlier portions of the film were shot. The studio, by the way, was Paramount Pictures in Hollywood.

Thanks, Chip!  I went to my neighborhood library and checked out a DVD of Holiday Inn watched that scene last night.  And, as is often the case, the scene as I remembered it turned out to be significantly different from the actual scene in the movie.  It seems my brain has a tendency to embellish my memories of favorite scenes from the movies I've seen.  So the scene as I recall it, exists only in my mind, like a dream. 

In the actual scene, we are shown a camera on a boom.  And in my memory I shifted the perspective of the viewer to the the point of view from that camera, which starts out from a close up of Bing Crosby sitting in the Holiday Inn by a piano, smoking his pipe, and then the camera begins to slowly float upward to an aerial view until the viewer is above the set and you can see the tops of the set walls and the walls of the studio beyond them and snow is falling all around and White Christmas is playing and then "The End" appears superimposed over the scene.

I really like my memory of the scene better than the actual scene that inspired it.  ;o)

Your memory has elements of the ending of White Christmas as well.  Especially the walls moving away to reveal the falling snow.

Yes, but the giveaway here is that Will mentioned that the scene he recalled was in black & white.

Holiday Inn was in black & white, while White Christmas was in color.

Right you are, Chip!  What I recall is a black and white sequence.

But now Nostaliac has piqued my curiosity, so I think it's time for me to take another  look at White Christmas.

It might turn out that in my memory I've conflated those two sequences from two different movies into a single sequence.