| 1-2 | Preparatory: simple rhythms, short phrases, non-technical |
| 3-4 | Elementary: both simple and compound meters, limited technique |
| 5-6 | Intermediate/moderately difficult: some technical and range demands, moderate musical concepts |
| 7-8 | Difficult: technically and/or rhythmically difficult, mature musical concepts |
| 9-10 | Advanced/professional: demanding technique and complex rhythm, may include extreme range and/or avant-garde performance techniques |