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| | The Classical Free-Reed, Inc. Taxonomy of Musical Instruments |
 | | This instrument is extremely hard to classify exactly, since, depending on the shape of the cavity created between the thumbs, the grass reed can be proved to be both beating and free, or neither. |
 | | Many free aerophones do not use pipes (accordion, concertina, etc.), but for those instruments that do have pipes (such as the shêng, sho, khaen and organ reed pipes), pipe length has no effect on the pitch, although the pipe does function as an acoustical reinforcement for the sound. |
 | | Most tongues of free-reeds are made from metal, but tongues of primitive free-reed instruments, like the naw, are made from cane. |
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