This picture shows gone-soloist singer Roberto Flores with his own musicians after leaving Enrique Rodríguez in early 1940. Flores went on to tour several Latin American countries, kept working as a soloist in Argentina with reasonable success and ultimately ended up in Medellín, Colombia, a city known for its tango enthusiasts, where he lived until his death.
There are a few recordings that allow you to imagine what this orchestra sounded like. Quite nice, as far as I am concerned. Even though Flores went solo, in this case his team still made dance music, where the role of the singer is limited. Usually, famous singers would sing an entire song, which is not dance music, but tango canción, like the work of Carlos Gardel.