At the beginning of the lecture, Professor Thedeen talks about the tempo of the last variation. He recommends not to play 'all tasto' because with the orchestra the sound will not be clear.
In Variation IV, Thedeen corrects some aspects, such as phrasing, rhythm and scales. The student should be careful when the music goes from quick passages to cantabile notes because these pitches are affected by the speed of the previous passage. So, it is convenient to sing the notes specially.
Professor Thedeen also corrects the articulation and the dynamics of the trills and comments that it is important to have a very good contact point to explote the sound possibilities of the cello. Breathing is crucial in dramatic passages. He explains how to play the 'spiccato' and talks about fingerings and chords -each one has a different resonance depending on the vibration of each string. Finally, Thedeen explains that the us of 'portamento' is possible in some expressive passages.