The first folk festival I ever went to, an Irish piper, still full of enthusiasm with his discovery, dragged an autoharp player on stage with him saying, "He plays autoharp American style and I play pipes Irish style - they go together like ham and eggs! Sounded pretty good, too. Some years later, I heard Bob McQuillan play a duet with a highland-style piper (Bob plays a "Stomach Steinway" aka an accordion.) Sounded grand.