At the beginning of the lecture, Professor Fried gives general recommendations about the meaning of playing with someone else and about what it implies, in terms of gestures, communication and the rapport among parts. It is important, as musicians, to show the particular characteristic of each music (she makes a comparison between Tartini's Sonata and Tchaikovsky's Concerto).
Regarding the harmonic aspects, each sound has to be adapted to the harmony and listened to in a more conscious way. Harmonic rhythm is also very important. In the cadenza (completely composed by Kreisler) the harmony in dominant-tonic has to be played with more sound. The professor explains some aspects of the trills: it is necessary to be in time before the trill's passage, so that they are not late. They must be played as if going up the steps.
There is a final recommendation about listening as much as possible, attending master classes with other teachers, and as much information as possible, in order to become an open-minded person.