The symphonie concertante, a product of the late eighteenth-century Parisian concert societies, provided a vehicle for display of the virtuoso style sought by contemporary audiences. The works of the Chevalier Joseph Boulogne de Saint-Georges, one of its chief exponents, served as strong influences on the development of the form and its diffusion throughout Europe. The symphonies concertantes of Opus VI, No. 1 and Opus X, No. 2 (according to thematic numbering of Barry S. Brook) date from ca. 1775 and 1779 respectively. A complete set of parts for each is to be found in the private collection of M. Andre Meyer in Paris (Opus VI) and in the Universitetsbiblioteket at Lund (Opus X). The thesis contains background material on contemporary Parisian musical society and the life of Saint- Georges, and a modern scoring of the above symphonies concertantes with analysis and conclusions.

The guitar chord (a sonority based on the open strings of the guitar) is one of Alberto Ginastera's compositional trademarks. The use of the guitar chord expands throughout forty years, creating a common link between different compositional stages and techniques. Chapters I and II provide the historical and technical background on Ginastera's life, oeuvre and scholar research. Chapter IV explores the origins of the guitar chord and compares it to similar specific sonorities used by different composers to express extra-musical ideas. Chapter V discusses Ginastera's initial uses and modifications of the guitar chord. Chapter VI explores the use of the guitar chord as a referential sonority based on Variaciones Concertantes, Op. 23: I-II, examining vertical (subsets) and horizontal (derivation of motives) aspects. Chapter VII explores uses of trichords and hexachords derived from the guitar chord in the Sonata for Guitar Op. 47.