This dissertation draws some of the innovative composers from the early 1900's to the 1960's into the spotlight to highlight their new musical and pianistic ideas. These composers, including Debussy, Schoenberg, Webern, Bartók, Cowell and others, brought new creative forces into piano music, generating many distinctive features of modern music. The discussion of new resources in harmonic language, timbre, texture, form and concept of time has a direct bearing on aspects of Richard Wilson's Eclogue itself as well as aspects of performance problems. American Composer, Richard Wilson, has written three substantial piano solo works, Eclogue, Fixations, and Intercalations. Eclogue, from 1974, is a one-movement work. The detailed analysis of Eclogue covers aspects of form, harmonic language, timbre and texture, and rhythm and time. In addition, essential issues of performance problems such as notation, rhythmic control, extended techniques, hands distribution, and pedaling are also discussed.