Many years ago I was going through a method book and found a series of variations that was sort of interesting, but sort of boring. I took the idea and added a whole bunch of more complicated ideas, all over a very famous chord structure that is very famous in Spanish music, most of all in guitar music. That progression is always Am, G, F and E, those chords. But I did not like the theme. Recently, I rewrote the theme to something I like a bit better.