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346 MUSIC IN FIXED RHYTHM<br />

Passages of this sort, called dausulae or puncta, will occupy our<br />

attention in the next section: meanwhile it should be remarked that<br />

as soon as organum is found written for three voices, with a triplum<br />

above the duplum, there must of necessity be agreement between the<br />

two upper voices in the matter of time-duration. The system of modal<br />

notation is now, therefore, applicable throughout:<br />

Ex. 189*<br />

seen<br />

These earliest organa are very frequently associated in histories<br />

with the name of Leonin, a precentor of Notre-Dame at Paris, who<br />

flourished c. 1150-75. A certain number are known from before his<br />

time, notably those of St. Martial and those in the Codex Calixtinus<br />

(see p. 288). Our information about Leonin and his great successor<br />

1 Florence, Bibl. Laur. plut. xxix, 1, fo. 14.

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