An electronic piano is provided in which activation of a keyboard (7) and foot pedals (8) causes sound to be generated and output via a pair of conventional cone loudspeakers (210-212) each comprising a tweeter (214), a woofer (216) and a base (218). Simultaneously with the activation of the conventional cone loudspeakers (210, 212), sound corresponding to the notes played by using the keyboard (7) is also generated and output via two distributed mode loudspeakers (220, 222) which are arranged to output sound through the inducement of resonant vibrations. The conventional cone loudspeakers (210-212) act as a series of discrete point sound sources. The distributed mode loudspeakers (220, 222) act as diffuse point sources generating sound across the entire surface area of the panels (220, 222). The air disturbance patterns propagated by the two different types of sound source result in sound more closely emulating the sound generated by a conventional high quality acoustic grand piano.