"Calvocoressi (1923) enucleates three considerations which determine what a critic writes:
1. Predispositions (what the critic likes, biases, temperament, knowledge, experience);
2. Direct data (the music, its themes, harmonic and rhythmic character, its style);
3. Indirect data (correlated sources, disclosures by the composer, information derived from other sources, annotations, discussions, other compositions by the same composer or other composers of the same school).
Even though the critic doesn't have use of the stave or clef, it's possible to pay attention to direct data and write about the music, sharing with the reading audience what the music sounded like or how it made you feel when hearing it.
the south african music teacher