Abstract: A musical instrument having a body comprising a case and a sound board closing one side of the case and strings stretched on the instruments so as to impart a force on the soundboard, in which the edges of the soundboard are movable relative to the adjacent edges of the case. A ridge is provided on the underside of the soundboard, along its edges, which serves to impart rigidity to the soundboard and is also formed to reflect sound vibrations. The instrument is preferably of the harp type having a neck connected at one end to the upper end of the body, the strings being connected to and stretched between the neck and the soundboard. A post extending from the neck is secured to the soundboard by means of a horizontal strut secured to and extending normal to the bottom end of the post.