I play piano. Sometimes, measures in pieces are separated by a double vertical line instead of a single one. What does this signify?
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In addition to indicating the end of a distinct section of the piece, a change in key signature, time signature or major tempo change, the double bar is also used to mark the location of a Da Capo or Dal Segno (a notation system that marks the repeating of a certain section of music without requiring additional measures to be written/printed.) It is also used when a "fine" (end) of the piece appears in the middle of the piece. These examples are described and illustrated on the following website: http://piano.about.com/od/musicaltermsa1/g/GL_double-barline.htm |
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Adding to what Stephen Hazel said, a double-line can also indicate an abrupt change in key, key signature, tempo, or time signature or metrical phrasing or a different rhythm. It is basically a cue to alert the musician that one section of the piece is ending and a new section that is substantially different is beginning. |
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end of a section of music usually (such as chorus, verse, bridge, etc). sometimes of a lengthy "phrase" of music. |
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