Well, I'd like to start out by saying, what the heck key is this in???? Anyway, this piece is an example of ternary form. The A section goes from the beginning until the poco piu mosso marking. The melody begins in the fifth measure, but I still have a hard time finding any real sense of tonality, or a strong pull towards do. The A section seems to be a parallel period. The first phrase ends on a PAC in G major in measure 12. The second phrase ends on an IAC or a PAC, but I am not exactly positive which. The last 9 measures of the section seem to be an extension, which develops the theme as well as creates a transition into the B section. The structural phenomena worth mentioning are crescendos, sforzandos, repetition, and of couse the changes in tonality. This section has modulated by the end, so it would be tonally open.
The B section is much softer and more accented than the A section, and it has a completely different feel and mood.The rhythm and the texture are also much different from the A section. There is a call and response kind of thing going on between the right hand and the left hand. There is then a 5 bar transition back to the A section. As far as I can tell, the B section is tonally open.
We then have the return of the A section, but it is differeny rhythmically and texturally than it was the first time. There are also embellishments added.
Thats it as near as I can tell... Id love to go over this one tomorrow so I could figure out what is happening with all the key changes...