A nighthawk is a nocturnal bird, hence the name. Value contrasts create the minute illusions of form in the shining, glossy hair atop the woman’s head, as well as the concavity of the male patrons’ fedoras.
I am not really into Country songs. The closest I could think of as Country (Even though it's Jazz) is Jack Wall, who made one of my favorite song (Snakeskin Boots)