A rest is an interval of silence in a piece of music, marked by a sign indicating the length of the pause. It is generally said that the pauses in a piece of music are as important as the notes.
In modern western musical notation, the most common rests (in descending order of length) are:
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The combination of rests used to mark a pause follows the same rules as for notes. For more details see note value.
Bar rest
When a single measure contains no notes, a semibreve (whole) rest is used, regardless of the actual time signature. The only exception is for a 4/2 time signature (four mimims per bar), when a breve rest is typically used for a bar's rest.
Multiple measure rest
In instrumental parts, rests of more than one measure may be indicated with a multiple measure rest, showing the number of measures of rest, as shown. Typically the rest symbol itself is a horizontal bar with serifs on the end, but for shorter rests (8 measures or less) breve or long rests may be used.