This section introduces the previously skipped over strings of the guitar (E, A and D) thus completing your knowledge of the open strings E, A, D, G, B, E. The open string names are really useful to be able to recite from memory as you can work out any note from this open string reference point. For this reason, the short rhyme Elephants And Donkeys Grow Big Ears is a great way to memorise it. Further on from this the application of the D string is also approached with the addition of the notes E and F.