In general, they work in detail aspects such as phrasing, articulation and character of each variation. The phrasing is explained in relation to the harmony. Professor Bennett comments that sometimes it is necessary to adapt the lips to the embouchure to play some notes (e. g. D#). They also talk about different versions of the melody in some editions and study the breathing points in several passages, e. g. he advises the student not to breathe between phrases.