In this new duet the first two notes of the right hand face each other: the F and the E. It could happen that you encounter emission problems in these notes because they start to be more serious and therefore need, with patience and constancy, to be studied first through the exercises on the long notes. The sound may be puffy and stimulated and the teacher will try to solve this problem by helping you to position your lips correctly and to blow in the right direction. The note Bb is also added: it will be the teacher who will have to explain the difference of the position in Bb with the key of Briccialdi and A #, emphasizing the convenience of using the Briccialdi key when the alteration is present in the key.