Piano Sonata No. 10 (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._16_(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.