Modifying the da capo? Through-composed arias in vocal works by bach and other composers

Abstract

Among the many unique features of the vocal music of Johann Sebastian Bach is the use of what has been called 'free' or 'modified' da capo form in roughly a third of the movements that have an overall ternary design. Bach's reason for adopting this distinctive form, used in duets and choruses as well as arias, has been the subject of frequent speculation by scholars, who have found precedents in works by Alessandro Scarlatti and parallel examples in the music of Handel. Through close analysis of text and music in numerous examples, this study demonstrates that Bach's version of this design is a defining element of his style; although it resembles early types of sonata form, it is distinct from anything in the music of his predecessors and contemporaries. No single explanation can account for his use of it, but most examples demonstrate Bach's close attention to particular formal or rhetorical features of their poetic texts. I propose a new term, 'through-composed da capo form', for this design. Its prominence in Bach's music is a product of his emergence as a composer during a period when German poets and musicians were adopting new approaches derived from the Italian tradition of opera seria but had not yet reduced them to formulae. © Cambridge University Press 2011.