Charles Welles Rosen (May 5, 1927 – December 9, 2012) was an American pianist and writer on music. He is remembered for his career as a concert pianist, for his recordings, and for his many writings, notable among them the book The Classical Style.
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Charles Rosen in the context of BWV 1079
The Musical Offering (German: Musikalisches Opfer or Das Musikalische Opfer), BWV 1079, is a collection of keyboard canons and fugues and other pieces of music by Johann Sebastian Bach, all based on a single musical theme given to him by Frederick the Great (King Frederick II of Prussia), to whom they are dedicated. They were published in September 1747. The Ricercar a 6, a six-voice fugue which is regarded as the high point of the entire work, was put forward by the musicologist Charles Rosen as the most significant piano composition in history (partly because it is one of the first). This ricercar is also occasionally called the Prussian Fugue, a name used by Bach himself.
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A secondary development, in music, is a section that appears in certain musical movements written in sonata form. The secondary development resembles a development section in its musical texture, but is shorter and occurs as a kind of excursion within the recapitulation section.
Charles Rosen, who has written extensively on the concept, presents the idea as follows:
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