Text: The name of the seventh degree o fthe scale of Co. It was first suggested as a solfeggio syllable by Ericus Puteanus, or Dodrecht, in 1580, and again by Lemaire, of Paris, about the year 1690. In the scale as divided into hexachords by Guido, the seventh note as the first was called Ut; but the use of solmisation rendered a seventh name necessary. Za and Sa were both suggested at different times, the latter because it was a portion of the first syllable of the word sancte, one of the concluding words of the verse of the hymn which gave the names to the other notes.

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Source: 125