The correct answer to this open question is the following.
Music helped to unify people during the great depression in that it was the positive common bond that existed in those years of so much pain and suffering.
The mood of the people was low, and songs such as "Brother, can you spare me a dime?" did not help much to uplift the citizens. However, at that time. Jazz music in the South, specifically in New Orleans, changed the tone of the music and became very popular in the United States, helping people for some time, to forget the difficult moments and sing their hearts out.