Aiguino da Brescia, Illuminato
- Karol Berger
(b ?Orzivecchi or Orzinuovi, nr Brescia, c1520; fl 1562–81). Italian theorist and Franciscan friar. He was influenced by Pietro Aaron, to whom he referred as ‘my indisputable teacher’, by Spataro and by Marchetto da Padova. His Illuminata de tutti i tuoni di canto fermo (Venice, 1562) expounds a modal theory applicable to plainchant: a mode is a form of diatonic octave divided into segments of 5th and 4th; corresponding authentic and plagal modes comprise the same segments but in reverse order, and the order of steps within the segments is also reversed, ascending in the authentic and descending in the plagal modes. There are eight regular modes (authentic and plagal) with finals on d, e, f and g, and six irregular modes with finals on a, b and c′. The treatise is largely devoted to modal identification of chants with an ambitus smaller or greater than an octave, or which use more than one mode. Identification is based primarily on the predominance of the segments of a single mode, especially those of the 5th, within a chant, and only secondarily on the final and ambitus. Aiguino’s ...