This document provides a resource for Franz Liszt's unfamiliar piano work, the Grosses Konzertsolo and his subsequent rearrangement of the work for two pianos entitled Concerto pathetique. The Introduction places the work in its historical context as a precursor to the great Sonata in B minor and discusses possible reasons for its various revisions. Chapter One details Liszt's productive years from 1849-1853 in Weimar and selected keyboard works from this period which are closely related to the Grosses Konzertsolo. Chapter Two provides information on Liszt's first published piano works and his experiments with form, as well as a comparison of the Grosses Konzertsolo with the Sonata in B minor, in terms of motivic and thematic development. Technical issues and obstacles to performance are also addressed. Chapter Three compares the Concerto pathetique with the Grosses Konzertsolo showing how Liszt's rearrangement becomes more practical as well as effective. Chapter Four discusses Hans von Bulow's version of the Concerto pathetique and includes a brief biography.