Meter is a term used to describe how the beats of a piece of music are grouped together. Music across all cultures includes meter: patterns of strong and weak beats. Lyrics are often written to coordinate with the meter in distinctive and purposeful ways that add to the emotional impact of the song. The cerebellum, with its internal timer, enables human beings to synchronize foot-tapping to the meter of the song. (Sternberg, Barbara, PhD. Music & the Brain. p 7-9. CA: Institute for Natural Resources, Home-Study #2320, 2009).