As the early banjo repertoire started from somewhere, we can look back into the same sources and continue the work. Polkas were quite popular, and we find them in some of the banjo tutors...especially Buckley's, and Dobson. Here is a little gem I found. It would sound nice with an ensemble backing. The song is keyed in "F" which normally fretless players either transpose or avoid. It doesn't have to be that way. Just look for "general banjoness " in the song. The Converse Hammer Stroke is a great tool for executing single lines...with almost no restrictions.