Eine Kleine Nachtmusik Mozart

The Menuetto and trio from Mozart's Eine Kleine Natchtmusik is in composit ternery form. The A section is in rounded binary form. With the first half being closed because it stays in the beginning key of G major. the second half of the A section has a small transitional period and then returns to the beginning theme for the last 4 measures back in the key of G. Next we have the trio section which is the B section in the larger picture. This section is also in rounded binary form. It starts in the key of D (the dominant of G) with the first half ending in D making this section closed. The next half flirts with the dominant of D (a major) a little bit but then returns to the original D key at then end of it's section. And finally, we return back to the beginning of the Menuetto or the A section.