The Probert Encyclopaedia of Music

MOTET

A motet is a form of sacred choral composition of moderate length, set to Latin words, and from the 14th century frequently used to supplement the service of high mass. Its music is written in one or other of the old ecclesiastical modes, and the theme is generally of a sacred character, as the melody of a plaint chant; but secular melodies have also been utilised. Certain sections usually contain passages for solo, which choral accompaniment in fluid counterpoint.
Research Motet