With polymetre, the bar sizes differ, but the beat remains constant. Since the beat is the same, the various metres eventually agree. (Four bars of = seven bars of ). An example is the second moment, titled "Scherzo polimetrico", of Edmund Rubbra's Second String Quartet (1951), in which a constant triplet texture holds together overlapping bars of , , and , and barlines rarely coincide in all four instruments.
with polymetre the bar sizes differ but the beat remains constant since the beat is the same the various metres eventually agree (four bars of = seven bars of ) an example is the second moment titled "scherzo polimetrico" of edmund rubbra's second string quartet (1951) in which a constant triplet texture holds together overlapping bars of   and  and barlines rarely coincide in all four instruments