Black bars............at the Nat zoo.......both for the sheet music.......................and for the musicians i think...............Crossroads...........Bluesman.......................river deltas.....Amazonia...................electric eels.......a map of the Amazon river basin superimposed on a map of the continental USA..........................an electromagnetic pulse..................of a nuke exploded in the air.......might disable electronics.................the clue is somewhere in DC.....

A bar line divides music into measures (also called bars), breaking up the musical paragraph into smaller, measurable groups of notes and rests as shown in the following figure where the slash marks represent each beat: Each measure has a specific number of beats — most commonly, four beats.

Musical Punctuation: Bar Lines and Measures - dummies

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