"In a very real sense, American popular music was the popular music of World War II. " -Music crtic
So, music produced in World War Two was mainly produced for those who went to war and for the families supporting them at home-front. Many songs were appropriated as for war-related tasks as well for the longing families at home.The mass distribution of music during WWII encouraged Americans everywhere to do their bit for the war effort.
By the time the war began, radio and phonograph records had evolved into a "mature" juke box culture. Most homes at a piano, so there was always entertainment.
During times of war, the lyrics in a song have the potential to convey a message more resonating than that of literature. For the majority of Americans during world war 2, music had a unifying, patriotic, and inspirational effect for or against the war effort. During a time where the nation is crumbling apart, music has the power to soothe and uplift in the darkest, most ominous of hours.