So most likely if you were alive in the 30's jazz would have been the cool thing to listen to because there is a lot of it early on in this list! It makes sense though. Bing Crosby was an artist who would release his hit song "Brother, Can You Spare a Dime?" in the world of jazz. Considering the history of the 30's, The Great Depression, it makes sense why audiences were loving this song and making it a hit.
Summary: The song was first part of a 1932 musical, Americana, but when Bing Crosby did a recording with the The Brunswick Crosby recording company that is when the song would take off to be a huge hit. The song was made to be sung on broadway, but obviously found a popular audience outside of that genre as well, and probably fit better as well considering the elements of the song didn't adhere to traditional broadway format.
