The motet arose from discant (clausula) sections, usually strophic interludes, in a longer sequence of organum, to which upper voices were added.
Usually the discant represented a strophic sequence in Latin which was sung as a discant over a cantus firmus, which typically was a Gregorian chant fragment with different words from the discant.
The practice of discant over a cantus firmus marked the beginnings of counterpoint in Western music.
Nevertheles the syght of discant is sometyme abowe the plainsong and sometyme with the plainsong and so every discantor of the mene shall begyn his discant with the plainsong, as I said before and the fyfte abowe the [-145-] plainsong in voce.
Neverthelesse he that syngyth the mene of discant may sometyme syng a 10, if the plainsong gos low, and so the syght of the 10 in his degree is a sext abowe the plainsong.
[8.] the discantor of the trebill shall begynn his discant with the plainsong in syght, as I sayd before, and the 8 abowe in voce, the 3 beneth the plainsong in syght and the 6 abowe in voce.