http://www.nulime.com/Harmonium-Keyboard-Piano-c3295.htmlHarmonium in Musical Instrumentsen-usCopyright 2003-2009 NuAlpha, Inc.Sat, 03 Jan 2009 09:02:01 GMThttp://www.nulime.com/c3295Harmoniums are in the family of free-reed aerophones. Harmoniums resemble small, tabletop size, organs. Each harmonium has a bellows at the back that is pumped by one hand while the other hand plays the keyboard. Inside they contain multiple chambers. There are different banks of free reeds in each chamber. The size and shape of each reed in the bank determines its pitch. Engaging Stops directs the airflow to various chambers. Each playing Key and each Drone controls the air through one or multiple reeds within a chamber. When engaged, Drones provide a continual harmony note and are played in unison with the keyboard. <a href="http://www.nulime.com/info_pages/harmoniums.html">More information on harmoniums</a>http://www.nulime.com/Harmonium-Keyboard-Piano-c3295.html