This video shows you a scene in which I'm teaching the student how to play the guitar for
Chega de Saudade (No More Blues), a Beatles song released in 1965.

The video starts with the 3rd bar of the 2nd page of the
sheet music. The first chord is Do7 (pronounced
D diminished seven) and the second one is DΔ7 (
D major seven).

This is one of the toughest part of the tune. This comes when about the two-thirds of the video have gone, where the student stumbles. The first chord is B13 (
B thirteen) and the second is B+7 (
B augmented seven).