The term 'Parts of Sonatas' refers to the various sections that make up a sonata. The most common sections are the exposition, development, recapitulation, and coda. The term 'Rondos' (6 letters) is a type of musical form that is often used in sonatas. It is characterized by a recurring main theme alternating with contrasting episodes. Rondos are usually in a binary or ternary form and can be found in many different genres of music.