How did World War 2 change music?

The music of the World War II era often reflected the patriotism and pride of America (music by performers from England, Canada, and other countries also adapted to promote patriotic emotions). Many love songs were written about the people (usually wives and mothers) waiting at home who missed their men fighting overseas; there were also songs that encouraged Americans to stay strong, and to keep supporting the fight against Hitler & the Axis powers.

And while many songs were serious, other songs were humorous, giving the public a chance to laugh at life in the military ("The Boogie Woogie Bugle Boy of Company B," was a hit for the Andrew Sisters, for example), or even to mock Hitler ("The Fuehrer's Face" by Spike Jones and his City Slickers). This was the Big Band era, and many famous bandleaders like Glenn Miller, as well as solo vocalists like Kate Smith, used radio (the dominant mass medium of that time) to show support for the war effort, and to perform the songs the public wanted, and needed, to hear.