The Lumberjack Piano or The Hammered Dulcimer as its known outside of Michigan, is an instrument with the strings stretched over a trapezoidal sounding board. It is usually set on a stand, at an angle, before the musician, who strikes the strings with mallets. There is a great little book by Nancy Groce called The Hammered Dulcimer in America. It is available at the King County Library- because I just returned it. Listen to Bruce Hutton playing Haste to the Wedding / Harvest Home (medley). It can be found on his awesome 1978 Folkways Album Old Time Music- It's All Around.