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Division Following Arrival on Tonic

Sometimes a perfect authentic cadence can delineate a resting point that appears in mid-Periode. This can occur, for instance, if a perfect authentic cadence in the secondary key forms a new-key Grundabsatz that (1) marks the end of a Passo di mezzo that appears in the middle of the second theme; (2) appears in the middle or prior to a transition; or (3) marks the end of a transition, thereby forming a “third-level default medial caesura.” A third-level default medial caesura may also be established by a formal cadence, so that what in modern terminology might be understood as a secondary theme corresponds to a Nebenperiode. Finally, it is also possible in rare cases for a perfect authentic cadence in the home key to articulate the end of a transition section, thereby forming a “fourth-level default medial caesura.”