The chant should never be sung with musical notation but should be done in a monotone and with uniform voices. Ordinarily, everything should be recited, and also the Mass, for the Lord will be served if some time remains so that the Sisters may earn their livelihood.
Saint Teresa of Avila
The Constitutions, no. 3
Teresa of Avila, St. 1985, The Collected Works of St. Teresa of Avila, translated from the Spanish by Kavanaugh, K; Rodriguez, O, ICS Publications, Washington DC.