* Contour: The shape of a musical line, or the way it moves up and down, is often similar to other lines in the piece.
* Rhythm: The rhythm of a musical line, or the way it is played in time, is often similar to other lines in the piece.
* Instrumentation: The instruments used to play a musical line are often similar to other lines in the piece.
* Function: The function of a musical line, or the role it plays in the piece, is often similar to other lines in the piece.
Differences between musical lines:
* Range: The range of a musical line, or the highest and lowest notes it plays, can be different from other lines in the piece.
* Timbre: The timbre of a musical line, or the sound quality of the instrument used to play it, can be different from other lines in the piece.
* Dynamics: The dynamics of a musical line, or the volume at which it is played, can be different from other lines in the piece.
* Articulation: The articulation of a musical line, or the way the notes are played (staccato, legato, etc.), can be different from other lines in the piece.