Category 4. Ties, Slurs, Beams, and Stems
When polyphonic parts are notated on one staff, the segmentation of beams may be non-coincident.
Ex. #26. This illustration was produced by Giovanni MĒller using an interactive editor developed on a LILITH workstation. It appeared in the Directory of Computer Assisted Research in Musicology 3 (1987), 71.
Additionally, especially in music written in the twentieth century, beams may extend across barlines.
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