chapter  2
24 Pages

Motet Citations in the Speculum, and Petrus de Cruce

In addition to providing the only link with the contemporary polyphonic repertory, his motet citations and their associated notation and commentary are among the strongest testimony we have at this time to relationships between theory and practice, and between theorists. They will now be considered at some length, not only for that reason, and in order to rectify some misunderstandings, but because they bear upon the biography of Jacobus and the dating of the treatise. First there follows in full the passage in Speculum VII. 17 that includes the motet citations, and in which Jacobus praises Petrus as a singer, composer and worthy follower of Franco:

In VII. 26 and again in VII.1 46 Jacobus defends Franco and Petrus against modern criticisms, reaffirming that the duplex long can be worth only two perfect longs, or six breves, not three longs (i.e. nine breves), as asserted by the moderns. This effectively denies the power of maximodus, and any organisation of time above the level of the long.2