Basic Level (B)
Musicians who can play a few tunes, know their way around the main notes of the instrument, and have some knowledge of note-names, written music and/or chord-symbols. On melodeon, they will have begun to use the left-hand bass and chord buttons.
Intermediate Level (I)
Musicians who can play in the usual keys of the instrument, have knowledge of where to find all the notes, a fair idea of rhythm, and can follow at a reasonable pace. They will have started to learn to control the sounds (i.e. loudness and attack), to consider musical style, and perhaps to experiment with harmony and ornamentation.
Higher Level (H)
Musicians who can play with a degree of fluency, understand the layout of the instrument, can find notes as required, and keep a fair rhythm and pace. They will be exploring various aspects of their music such as style, phrasing, dynamics, accents, rhythms, harmony, ornamentation and technique.