This study is an attempt to shed some light on the treatment of one dissonance—the seventh—in the works of the following composers: Cipriano de Rore (1516-1565); Philippe de Monte (1521-1603); Giaches de Wert (1535-1596); Luca Marenzio (1553-1599); Carlo Gesualdo (ca. 1560-1613); and Claudio Monteverdi (1567-1643). The purpose of this thesis is to discover (1) the frequency of occurrence of primary (relatively accented) sevenths and their inversions (^ chords, etc.) in a selection of each composer's madrigals; and (2) the methods of handling sevenths employed by each composer, with particular emphasis on the relationship between these methods and sixteenth century theory.

Heinrich Koch completed his treatise in 1793, a pioneering work regarding the musical phrase as well as a sonata form description (lacking that term). Composition of Opus 18 began in 1798, a momentous project for several reasons in Beethoven's early career. Here, the theories expressed in Koch's Versuch are taken as an analytic springboard into a thorough analysis of the first movement of the quartet published no. 3, which was the first composed; additionally, nos. 1 and 6 are explored to a lesser degree. This study in phrase-analysis demonstrates significance in the fundamental ideas of Koch as applied to a masterwork of the turn of the 19th century.