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The bones are a musical instrument (more specifically, a folk instrument) which, at the simplest, consists of a pair of animal bones, or pieces of wood or a similar material.

Sections of large rib  bones and lower leg bones are the most commonly use true bones, although wooden sticks shape like the earlier true bones are now more often use.

The technique arrived in the U.S. via Irish immigrants, but has a history stretching back to ancient China, Egypt, Greece, and Rome.

They have contribute to many music genres, including 19th century minstrel shows, traditional Irish music, the blues, bluegrass, zydeco, French-Canadian music, and music from Cape Breton in Nova Scotia.

The clacking of the loose rib bones produces a much sharper sound than the zydeco washboard or frottoir, which mimics rattling a bone up and down a fixed ribcage

Bone, rigid body tissue consisting of cells embedded in an abundant hard intercellular material.

The two principal components of this material, collagen and calcium phosphate, distinguish bone from such other hard tissues as chitin, enamel, and shell. Bone tissue makes up the individual bones of the human skeletal system and the skeletons of other vertebrates.

The functions of bone include

(1) structural support for the mechanical action of soft tissues, such as the contraction of muscles and the expansion of lungs

(2) protection of soft organs and tissues, as by the skull

(3) provision of a protective site for specialized tissues such as the blood-forming system (bone marrow)

(4) a mineral reservoir, whereby the endocrine system regulates the level of calcium and phosphate in the circulating body fluids.

Evolutionary origin and significance

Bone is found only in vertebrates, and, among modern vertebrates, it is found only in bony fish and higher classes.

Although ancestors of the cyclostomes and elasmobranchs had armored headcases, which served largely a protective function and appear to have been true bone, modern cyclostomes have only an endoskeleton, or inner skeleton, of noncalcified cartilage and elasmobranchs a skeleton of calcified cartilage.

Although a rigid endoskeleton performs obvious body supportive functions for land-living vertebrates, it is doubtful that bone offered any such mechanical advantage to the teleost (bony fish) in which it first appeared, for in a supporting aquatic environment great structural rigidity is not essential for maintaining body configuration

. The sharks and rays are superb examples of mechanical engineering efficiency, and their perseverance from the Devonian Period attests to the suitability of their nonbony endoskeleton

In modern vertebrates, true bone is found only in animals capable of controlling the osmotic and ionic composition of their internal fluid environment.