The most common clave pattern used in Cuban popular music is called the son clave, named after the Cuban musical genre of the same name. Clave is the basic period, composed of two rhythmically opposed cells, one antecedent and the other consequent. Clave was initially written in two measures of 2 4 in Cuban music.
Eon, a variation of aeon, is defined as a unit of geological time equal to a billion years, or a very long period of time. An example of an eon is the unit of measure used when talking about how long ago the solar system was created.
The Precambrian Eon. The name means: before the Cambrian period.. This old, but still common term was originally used to refer to the whole period of Earth's history before the formation of the oldest rocks with recognizable fossils in them. Eon (from the words crypt = hidden, and zoon = life).