pearl percussion!

pearl percussion

Comprehensive Analysis

1) "Pearl" -- As to pearl percussion 1pearl Pronunciation: 'p&r(-&)l Function: noun Etymology: Middle English perle, from Anglo-French, probably from Vulgar Latin *pernula, diminutive of Latin perna upper leg, kind of sea mussel; akin to Old English fiersn heel, Greek pternE 1 a : a dense variously colored and usually lustrous concretion formed of concentric layers of nacre as an abnormal growth within the shell of some mollusks and used as a gem b : MOTHER-OF-PEARL 2 : one that is very choice or precious 3 : something resembling a pearl intrinsically or physically 4 : a nearly neutral slightly bluish medium gray Pronunciation Symbols Strand of akoya pearls from China Pearl farm, Seram, Indonesia A pearl is a hard, rounded object produced by certain animals, primarily mollusks such as oysters. Pearls can be used in jewelry and also crushed in cosmetics or paint formulations. Pearl is valued as a gemstone and is cultivated or harvested for jewelry. Pearls are formed inside the shell of certain bivalve mollusks. As a response to an irritant inside its shell, the mollusk will deposit layers of calcium carbonate (CaCO3) in the form of the minerals aragonite or calcite (both crystalline forms of calcium carbonate) held together by an organic horn-like compound called conchiolin.This combination of calcium carbonate and conchiolin is called nacre, or as most know it, mother-of-pearl. The commonly held belief that a grain of sand acts as the irritant is in fact rarely the case. Typical stimuli include organic material, parasites, or even damage that displaces mantle tissue to another part of the animal's body. These small particles or organisms enter the animal when the shell valves are open for feeding or respiration. In cultured pearls, the irritant is typically a cut piece of the mantle epithelium, together with processed shell beads, the combination of which the animal accepts into its body. [1][2][3] The unique lustre of pearls depends upon the reflection and refraction of light from the translucent layers and is finer in proportion as the layers become thinner and more numerous. The iridescence that some pearls display is caused by the overlapping of successive layers, which breaks up light falling on the surface. Pearls are usually white, sometimes with a creamy or pinkish tinge, but may be tinted with yellow, green, blue, brown, purple, or black. Black pearls, frequently referred to as Black Tahitian Pearls, are highly valued because of their rarity; the culturing process for them dictates a smaller volume output and can never be mass produced. This is due to bad health and/or non-survival of the..." 2) "Percussion" -- As to pearl percussion per·cus·sion Pronunciation: p&r-'k&-sh&n Function: noun Etymology: Middle English, from Anglo-French percussioun, from Latin percussion-, percussio, from percutere to beat, from per- thoroughly + quatere to shake 1 : the act of percussing : as a : the striking of a percussion cap so as to set off the charge in a firearm b : the beating or striking of a musical instrument c : the act or technique of tapping the surface of a body part to learn the condition of the parts beneath by the resultant sound 2 : the striking of sound on the ear 3 : percussion instruments that form a section of a band or orchestra - percussion adjective Pronunciation Symbols A percussion instrument can be any object which produces a sound by being struck with an implement, shaken, rubbed, scraped, or by any other action which sets the object into vibration. The term usually applies to an object used in a rhythmic context and/or with musical intent. The word, "percussion", has evolved from Latin terms: "percussio" (which translates as "to beat, strike" in the musical sense, rather than the violent action), and "percussus" (which is a noun meaning "a beating"). As a noun in contemporary English it is described at Wiktionary as "the collision of two bodies to produce a sound". The usage of the term is not unique to music but has application in medicine and weaponry, as in percussion cap, but all known and common uses of the word, "percussion", appear to share a similar lineage beginning with the original Latin: "percussus". In a musical context then, the term "percussion instruments" may have been coined originally to describe a family of instruments including drums, rattles, metal plates, or wooden blocks which musicians would beat or strike (as in a collision) to produce sound. 1 History 2 Classifications 2.1 By methods of sound production 2.1.1 Idiophone 2.1.2 Membranophone 2.1.3 Chordophone 2.1.4 Aerophone 2.1.5 Electrophone 2.2 By musical function/orchestration 2.2.1 Definite pitch 2.2.2 Indefinite pitch 2.3 By prevelance in common knowledge 2.3.1 Conventional/Popular 2.3.2 Unconventional 2.4 By cultural significance/tradition 2.4.1 "World"/"Ethnic"/"Folk" drums 2.4.2 "Common" drums 3 Function ..." 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