music
posted by tina .
a rhythmic unit enclosed between a pair of vertical lines is called?

One of these sites should tell you what you need to know:
http://www.google.com/search?q=reading+music&ie=utf8&oe=utf8&aq=t&rls=org.mozilla:enUS:official&client=firefoxa 
You will probably find the answer more quickly here:
http://www.soundpiper.com/elements/rhythm.htm
The rhythmic unit between vertical ines is called a "measure". The vertical lines that define a measure are called "bars". Sometimes the measure itself is called a "bar".
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