LEAD |
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Lead is a chemical element in the periodic table that has the symbol Pb (L. plumbum) and atomic number 82. A soft, heavy, toxic and malleable poor metal, lead is bluish white when freshly cut but tarnishes to dull gray when exposed to air. Lead is used in building construction, lead-acid batteries, bullets and shot, and is part of solder, pewter, and fusible alloys. Lead has the highest atomic number of all stable elements. (But see the article on Bismuth, which has a half life so long it can be considered stable.)
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MUSIC |
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Music is an animal activity which involves structured and audible sounds, which is used for artistic or aesthetic, entertainment, or ceremonial purposes. Definitions vary in different cultures and social milieus. The definition of music as sound with particular characteristics is taken as a given by psychoacoustics, and is a common in musicology and performance. There are observable patterns to what is broadly labeled music, and while there are understandable cultural variations, the properties of music are the properties of sound as perceived and processed by humans.
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