The purpose of this study was to create a document which would provide a variety of insights into Mozart's Trio in E-Flat, K. 498, for piano, clarinet, and viola. Three specific areas were investigated. A melodic analysis of the work was developed with the intention of illuminating the structure of the musical material itself. This analysis explored the dual forces of unity and contrast. Specific motivic shapes were explored which serve to unite the various thematic areas of the work; other elements were identified which are consistently utilized to create contrast and conflict.Secondly, the writer undertook a comparison of current editions of K. 498. Editions were identified as one of three types. Those editions identified as Authentic sought to reflect Mozart's original manuscript; Interpretive editions presented an editorial view of the Trio. Imitative editions were developed entirely from previously existing editions. Comparisons were made both within individual categories as well as between categories. The writer conducted a personal investigation of Mozart's manuscript which provided valuable information regarding the authenticity of certain passages.The study concluded with an investigation of current views on the presentation of K. 498 in performance. Information was obtained from recorded performances of the Trio. In addition, the writer conducted a survey of the opinions of teachers and performers. Comments on the revision of specific passages relative to pitch are included, as well as opinions on tempo, meter, dynamics, articulations, stresses, balance, the interpretation of specific phrases, and musical character. / School of Music