The professor explains the importance of the control of bow movements (bow-arm). He also talks about articulation, phrasing, arpeggios, dramatic character, tempo, harmony and harmonic color, and the relation between melody and piano accompaniment. The direction of the arm has to be as a pendulum, making half circles, taking advantage of the energy. The width of the chords' movement determines the sound. They also talk about musical expression and how to perform arpeggio chords.