Example 19. Robert Parsons Ut re mi fa, mm. 116–125 with images from GB-Lbl Add. MS 30481, GB-Lbl Add. MS 30482, and GB-Lbl Add. MS 30483. Note that the bassus part uses two different proportional mensural symbols to notate the grouping changes, while the altus and tenor parts use only note values to communicate identical grouping changes.