Bar (music)  From Wikipedia, the free encyclopedia Jump to:
navigation, search  A bar or measure is used in writing music.
Each bar is a small amount of time. Most music has a regular
beat (or pulse) which can be felt. Each bar usually has the same
number of beats in it. Music that feels like 1-2-3-4-1-2-3-4
will be divided into bars with four beats-worth of music in each
bar.  The bar line (or barline) is a vertical line which
separates the bars.  At the beginning of the music there will be
a time signature which shows how many beats there are in each
bar.  A double bar does not mean "two bars". It means two single
barlines drawn close together, one being thicker than the other.
It is a "repeat sign". If there are two dots on the left of the
double bar line the player should go back to where there was
previously a double bar with two dots on the right, or back to
the beginning of the piece.  A double barline without dots shows
the end of a piece of music.   Barlines have been used since
around 1600.