US Patent 7488884 Keyboard musical instrument having sloped top surface

An electronic keyboard musical instrument has a cabinet, in which a tone generating system is housed, and the cabinet offers a sloped top surface to assistant goods; while the player is composing a piece of music with the assistance of a personal computer system, by way of example, the player puts the computer keyboard on the sloped top surface, and manipulates the computer keyboard without taking unnatural attitude so that the player can continue the work for a long time.