Many guitarists will be familiar with the Tanz der Wäsherin and Hupfauf by Hans Neusiedler, if only because they keep re-appearing as Examination pieces!
But despite being 450 years old, these two complementary pieces remain a busy and rhythmic joy to play and to listen to.
Here are versions with a second (countermelody) line that sits on top of the original guitar part. I wrote the countermelody so that my flute partner and myself could play them at a friend's wedding as part of an array of guitar/flute duets.
There is also a version for flute and guitar that you can buy. This version is similar but gives both guitarists a chance to play the (conventional) guitar part as well as the descant. The overall effort is surprisingly complex for little extra effort!
You can hear a snippet and see some of the score on the SMP website