Visualization of the Johann Sebastian Bach Chorale, “Ach bleib bei uns, Herr Jesu Christ.” The four voices (Soprano, Alto, Tenor, Bass) are represented by four colored lines. The X-axis is time and the Y-axis is pitch. Each circle represents a note. The area of each circle corresponds to the note's duration (ranging from eighth notes to dotted half notes). The lines connecting the circles indicate melodic intervals.