Now let’s take a look at the first section of the Tempus per Annum Kyrie again.
The chant begins on LA – the reciting tone, then descends to the home tone – RE, and back up again. The notes flow between these two anchor pitches, dipping above and below. Other melodies in Mode 1 might have a completely different pattern, but they will include the LA and the RE.
Gregorian chant is a particularly effective instrument for touching the “ear of our heart.”
Dom Jacques Hourlier –
Reflections on the Spirituality of Gregorian Chant