1. Also important was his system of solmization (sometimes called, after him, Aretinian syllables), whereby the syllables ut, re, mi, fa, sol, la are used as names for the six tones, C to A, known as the hexachord.

2. The six-voiced chord (Hexachord), also called an Aretinian syllable, provides easement in solfeggio and takes its current form with the addition of the syllable “Si.” However, today, there is the impression that in order for the syllables to provide an easement in solfeggio, they first need to be spoken