Bold Double Bar Line in Music Notation - Definition & Usage #3739435 (License: Personal Use)

This image displays a standard five-line musical staff with a bold double bar line at the right edge, consisting of two thick vertical lines (the second thicker than the first). In Western music notation, this symbol denotes the end of a major section, movement, or the entire composition. It is distinct from a regular double bar line (two thin lines), which typically marks the end of a lesser section or phrase.

Used in music theory education, sheet music publishing, and digital notation software tutorials; helps learners and performers identify structural boundaries in scores.