+A **free reed** is a thin, vibrating tongue, often metal, fixed at one end over an opening. Air pressure causes it to oscillate freely within its frame, producing a sustained tone. This principle powers instruments like the [Harmonica](/wiki/Harmonica) and the [Accordion](/wiki/Accordion), creating their distinctive voices.
+## See also
+- [Reed](/wiki/Reed)
+- [Aerophone](/wiki/Aerophone)
+- [Concertina](/wiki/Concertina)
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