José Rodríguez Alvira
Harmonically, the first two measures are very simple. The second measure is a repetition of the first:
In this prelude we find the main theme on the right hand as an interior voice. Most of the notes in the upper voice (32ths) reinforce the theme and harmony yet there are several appoggiaturas (diatonic and chromatic). The G# and B in the 1st and 2nd beat, the A# and C# in the 3rd beat and the B# and D in the 4th beat are an example.