| Level of Difficulty Key | ||
| Level | Description | Typical Performers |
| 1 | Easy | Children |
| 2 | Educational | Well-trained high school ensembles |
| 3 | Medium | Community, college, and church ensembles |
| 4 | Difficult | Professionals, high-quality college and church ensembles |
| 5 | Very Difficult | Virtuosi |