I've seen "Birds of Prey" only once, decades ago, but I remember it as great fun. It's also a piece of cultural history. It first aired on TV in January 1973, as the U.S. war in Vietnam was officially rushing to an end, and it's a cops-and-robbers adventure about helicopters, the chariots of choice of that conflict.
The setting is a big city in the American West. The villains are robbers -- Vietnam vets, perhaps? -- who make their getaway by chopper. The squabbling heroes are two middle-aged men who served together in World War II. One of them (played by Ralph Meeker) is now a successful bureaucrat, serving as the city's police chief. The other (played by David Janssen) is somewhere between a free spirit and a ne'er-do-well, a man who flies a traffic helicopter to earn a living but has never left behind the memories of the air war of his youth. When the robbers take to the skies, the battle of the generations is on.
They didn't call such men such as Meeker's and Janssen's characters "the greatest generation" in 1973. They called them "the establishment." This movie is nostalgia for the simplicities of World War II before such nostalgia was fashionable.
If the DVD version does indeed feature modern rock instead of the original movie's 1940s sound track, it's a shame. But maybe it's inevitable. Now that the World War II veterans have grown old and the Vietnam veterans have taken their place in the middle-aged zone, few viewers would recognize the great big band standards. Alas, time flies. Like a bird.