piano sonata no mozart hello you've recently added the following to this article in the recapitulation the main theme starts in c major modulates to g major and then modulates back to the subdominant key of c major isn't the piece in c major the subdominant would be f am i confused also note there is some discussion at talk piano sonata no mozart about how subdominant recaps were not that uncommon amongst lesser known composers of the day it was something haydn never did and mozart did very rarely cheers