He lead the our nation out of the Revolutionary War
The creation of distinctive classes in the North drove striking new cultural developments. Even among the wealthy elites, northern business families, who had mainly inherited their money, distanced themselves from the newly wealthy manufacturing leaders. Regardless of how they had earned their money, however, the elite lived and socialized apart from members of the growing middle class. The middle class valued work, consumption, and education and dedicated their energies to maintaining or advancing their social status. Wage workers formed their own society in industrial cities and mill villages, though lack of money and long working hours effectively prevented the working class from consuming the fruits of their labor, educating their children, or advancing up the economic ladder.
I didn't listen to the files in your lesson, so let's list the information we have:
-song composed or performed in 1941
-song written (together with) Billy Strayhorn
-song by Duke Ellington
There is one such song, and it's "take the "A" train" - I think this is the correct answer!