Sinfonia is a two movement work for chamber string orchestra and percussion consisting of at least five violins I, five violins II, five violas, five cellos, three string basses, and three percussionists playing timpani, two suspended cymbals, one small crash cymbal, 2 triangles, tambourine, woodblock, five temple blocks, snare, two tom-toms, 2 glockenspiels, xylophone, and chimes. The first movement is approximately nine minutes long, the second lasts five and one third minutes making a total of approximately fourteen minutes and twenty seconds.

This dissertation describes a compositional model rooted in cross-influential methodology between complementary musical compositions that share generative source material. In their simultaneous construction, two composition pairs presented challenges that influenced and mediated the other's development with respect to timbre, transposition, pitch material, effects processing, and form. A working prototype first provides a model that is later developed. The first work Thema is for piano alone, and the companion piece Am3ht is for piano and live computer processing via the graphical programming environment Max/MSP. Compositional processes used in the prototype solidify the cross-influential model, demanding flexibility and a dialectic approach. Ideas set forth in the prototype are then explored through a second pair of compositions rooted in cross-influential methodology. The first work Lusmore is scored for solo contrabass and Max/MSP. The second composition Knockgrafton is scored for string orchestra. The flexibility of the cross-influential model is revealed more fully through a discussion of each work's musical development. The utility of the cross-influential compositional model is discussed, particularly within higher academia.

This submission comprises a portfolio of fifteen original musical works and an exegesis that comments on five of these works. Recordings of twelve of the fifteen compositions are included. These pieces demonstrate an ongoing investigation into structure, and the discussion will provide an insight into the constant process of experimentation and consolidation involved in developing such a body of work. In the exegesis I open with a general conversation on the compositional process and then focus on the formal problems inherent in this process. I then discuss the five scores included in the main volume, looking at how each are formed, and comparing their formal characteristics. This involves an analysis of the musical materials and how such materials are treated through repetition and transformation. I will also look at the aesthetic and stylistic concerns and how they inform the formal architecture of each work. An appendix includes the scores of a further ten works, with a brief introductory commentary on each. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1351235 / Thesis (Ph.D.) -- University of Adelaide, Elder Conservatorium of Music, 2008