I think this is one of the parts of early minstrel routines, where the company would enter, take their places on stage and do a routine of group and individual songs and jokes, led by Mr. Interlocutor and aided by Mr. Bones, Mr. Tambo, etc. I think the "walk around" was where the whole group did something together to the up tempo tune, possibly moving around the stage or into the audience. Of course the people from Oz land can speak to a "walkabout," I suspect.