簧风琴是一种小型的键盘乐器，靠振动簧片发声，音域一般为3-5个八度。不同的音栓可产生变化的音色，音量则有踩踏风板控制。第一家簧风琴是法国人德班制造的。一般的簧风琴由压出空气发声，但是美式的簧风琴是由吸入空气发声，音色更加柔和。

The pump organ, reed organ, harmonium, or melodeon is a type of free-reed organ that generates sound with free-reed.

More portable than pipe organs, free-reed organs were widely used in smaller churches and in private homes in the 19th century, but their volume and tonal range are limited, and they generally had one or sometimes two manuals, with pedal-boards being rare. The finer instruments have a unique tone, and the cabinets of those intended for churches and affluent homes were often excellent pieces of furniture. Several million free-reed organs and melodeons were made in the U.S. between the 1850s and the 1920s. During this time Estey Organ and Mason & Hamlin were popular manufacturers.