Difficulty Explanations
1: (Easy) No divisi in voice parts, accompaniment doubles or supports vocal parts, diatonic, symmetrical phrases, textures mostly homophonic, simple rhythms, stepwise voice leading (conjunct), moderate ranges, no extended techniques, and limited sustained singing.
2: (Medium Easy) Limited divisi, voices somewhat independent from accompaniment, some chromatics, phrases may be longer or more fragmented, mostly homophonic, moderate rhythmic complexity, some difficult intervals(disjunct motion), moderate ranges, extended techniques are simple, limited sustained singing.
3. (Medium) Limited divisi, unaccompanied, or with independent accompaniment (voice parts not doubled), many chromatics, phrases of varying lengths, more contrapuntal textures, moderately complex rhythms, some difficult intervals (disjunct motion), moderately difficult/challenging ranges, extended techniques are potentially challenging, and some sustained singing.
4. (Medium Difficult) Abundant divisi, unaccompanied, or accompanying instruments are fully independent from voice parts, many chromatics and/or key changes, long and/or broken phrases, potentially little homophony, complex rhythms, many difficult intervals(disjunct motion), difficult/challenging ranges, potentially difficult extended techniques, and a demand for sustained singing.
5. (Difficult) Adundant divisi, unaccompanied, or accompanying instruments are fully independent from voice parts, many chromatics and/or key changes, long and/or broken phrases, potentially little homophony, complex rhythms, extreme ranges, use of challenging or unusual extended vocal techniques, abundant sustained singing.
