Sousaphones-a-plenty in this 1932 illustration

[David Richoux]

A cartoon map of all the Harlem nightclubs and the bands that played in them - don't know if you have to be registered with Flickr to see it, but there are many downloadable sizes. http://www.flickr.com/photos/mikethibault/3311117592/

You can also see it (with some background info) here.

Does this blow a hole in the theory of the double bass having taken over in 1930's jazz, or is it just more fun to draw a sousaphone?