Gottlob Harrer (1703-1755) composed at least twenty-seven sinfonias for his patron Count Heinrich von Bruhl in Dresden from 1731-1747, placing them among the earliest concert symphonies written. Harrer's mostly autograph sinfonia manuscripts are significant documents that provide us with a more thorough understanding of musical activities in and around Dresden. Several of the works indicate topical references, including dance, march, and hunt allusions, that comment on the Dresden social occasions for which Harrer composed these works. Harrer mixes topical references with other gestures in several of his sinfonias to create what I believe is an unrecognized affective language functioning in instrumental works of the time. An examination of the topical allusions in Harrer's works solidifies their connection to the social milieu for which he wrote them, and therefore better defines the genre of the concert sinfonia of the time. The first part of this study of Harrer's sinfonias addresses evidence about the composer, his patron, Dresden society, and the circumstances surrounding the first performances of several works, musical evidence of the composer's stylistic and formal approach to the genre, and the rhetorical meaning of topical gestures in the scores in ways not yet explored. In this dissertation, I demonstrate that the stylistic and formal characteristics of Harrer's sinfonias were often influenced by the function and context of their premieres. Part Two of the dissertation provides transcriptions of Harrer's sinfonias, making them available for performance and further study in the hope that such a holistic approach will enrich our appreciation of musical life in Dresden in the 1730s.