Feldman wrote:So what does musical analysis give us? The study of sketches has allowed us to understand that while Haydn started from the theme and then developed it, Beethoven organized the form and structure of the piece simultaneously with the theme, planned the development, and based on certain choices made modifications to the theme and adapted it to the logic of his piece.... therefore analysis allows us to understand the HOW, not just the WHY of a certain strategic choice.
Does analyzing not mean understanding what the relationships are between the different elements of a large-scale composition and nothing more?7
I believe there is a substantial difference between pure description and analysis.
Studying sketches and performing musical analysis on the finished piece are different things. Today, many aim to integrate them, even though "methodologically" they also make sense as pure disciplines. I might be very interested in knowing how Beethoven constructed his compositions, but musical analysis of the finished composition explains to me how those compositions worked yesterday and today, how they are perceived, and for what reason Beethoven wanted to arrive at that finished product. The sketches unravel the path of the method he used to get there. But while musical analysis, being a synchronic discipline, finds "always valid" data and arguments (a statement to be taken with a grain of salt), the study of sketches, being a diachronic discipline—or rather, a historical one—is always subject to changing its course (due to the discovery of new sketches, the falsification of the authorship of existing ones, or other obscure philological mechanisms).
This is also to clarify that musical analysis and the study of sketches are different things, not interchangeable, with different methodologies and purposes. Schenker did not want to understand the creative process; rather, he wanted to demonstrate a formal, syntactic, "musical" theory, in a broad sense, according to which there are universal structures underlying most compositions in the tonal system. Awareness of these structures helps to understand the form of finished compositions and directs the listening and enjoyment of these compositions. Schenkerian reductions do not presume to speak of the creative and compositional process; they are, quite simply, analyses of the finished work.