This is a guitar that generally has one or more metal resonator discs inside the body, under the bridge. It was first produced by the National String Instrument Corporation of Los Angeles in 1925, working from a design by John Dopyera. Three years later, Dopyera left to set up (with three of his brothers) the Dobro corporation. The idea for the resonator actually came from the banjo, which often had a resonator disc in its back. The dobro design was really developed in response to the growing demand for a guitar that could produce a greater volume than was available with a more traditional guitar. It may be played in a sitting position (like a guitar) or across the knees, Hawaiian style. “Dobro” means “good” in Czech.