I believe I saw this documentary on PBS. If this is the same one with Michael Fienstein talking about composers and showing clips throughout, it must be the same one. I watched the show because Doris Day was prominently advertised, but it turned out to be another "Judy Garland Show." You'd think by looking at all these documentaries about movie musicals, etc., that Garland was the ONLY female making this type of film. FYI, Doris Day, almost single-handedly, saved this dying art form upon arriving at Warner Brothers to make "Romance on the High Seas" in 1948. During her seven hear contract at WB, she made 17 pictures, mostly musicals, including the legendary, "Calamity Jane."
Day, because of the backlash she received during the late 60s (the sexual revolution was taking place), is purposely slighted when today's retrospectives on Hollywood's "golden age" are presented. People felt it "fashionable" to disparage Doris Day as "un hip" and a "goody goody girl." Of course, all of this was nonsense, but it DID impact on how Day would later be treated when look-backs centered on the 50s and 60s movie stars. You'd think, by looking at these shows that Marilyn Monroe, Judy Garland and Elizabeth Taylor were bigger stars than Day. They were not. Doris Day remains, to this day, the top female box office attraction in the HISTORY of films. They can't take THAT away from her.
As I recall about this documentary, there was one clip of Doris Day, even though they have prominently placed her on the DVD box-cover. That's just to sell the product. Misleading.