There's a traditional chantey, of African-American origin, called "Dance Gals, Gimme the Banjo" that has these lines:

Today is the day we pick on the banjo/ Dance gal, gimme the banjo/ Oh, that banjo, that 7-string banjo/ Dance Gal, gimme the banjo/ Oh, that banjo, that talla talla wango/ Dance gal, gimme the banjo.

I love the onomatopoeia in that verse, and imagine a 7-string banjo sounds a lot like that.

Jerry