War films and musicals.

I sort of like war films sometimes. And I hate musicals with a passion.
But I was just watching a war film, and I realised they are not that dissimilar.
The thing I hate about musicals is that when people burst into song, you just have to sit through four or five minutes that effectively do nothing to advance the plot. Then the song ends and the dialogue begins again.
Well I just noticed war films are much the same.
They start out with a bit of a story. Then it becomes necessarry to do a bit of fighting, and you just get a few scenes of people shooting and throwing grenades and stunt-men doing somersaults out of machine gun towers, and then it's back to the story.
Cowboy films, on the other hand,the violence is usually quite short-lived, and tends to advance the plot somewhat.
"You dirty dog! You killed my partner, and now I'm going to kill you."
Bang. Bang.
And there's a narrative development.
Not like, "There's no business like Show Business, like no business I know!"
Or, senseless amounts of pyrotechnics and gunfire and then back to the story.
Maybe I'm on to something here.
Vietnam, the musical, perhaps?