Level A: For beginning organists just learning to read intervals on the staff. Clefs and time signatures are not included; notes with intervals larger than a third are labelled with the note name; only quarter, half, dotted half, and whole notes are used. Pieces progress from playing hands and feet separately through playing two parts at once, with some very limited use of three parts at once (RH, LH, pedals).
Level B: Designed to help beginning organists learn to read notes on a three-staff organ score, these pieces introduce just one set of notes at a time, beginning with C, and use intervallic reading for the rest of the notes. Clefs and time signatures are included. Ties, eighth notes, and dotted quarter notes are introduced. Pieces progress from playing two parts at once to playing three parts at once.