Most music has a regular pulse called beat .
Beats generally group themselves into regular patterns of either two, three or four.
A double bar line separates different sections of music within the piece. A Time Signature is placed at the beginning of each piece to show how many beats there are in each bar, and the type of note that equals one beat. The Time Signature is shown as a fraction. The upper number indicates the number of beats in each bar. Cut Time , is written as a C with a vertical stroke through it.