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.
1 An example of an eon is the amount of time since dinosaurs roamed the earth. 2  an extremely long, indefinite period of time; thousands and thousands of years. 3  Geol.  the major unit of geologic time, usually subdivided into eras.