William John Evans, known as Bill Evans , was an American jazz pianist and composer who mostly worked in a trio setting. He is widely considered to be one of the greatest jazz pianists of all time, and is considered by some to have been the most influential post-World War II jazz pianist. Evans's use of impressionist harmony, inventive interpretation of traditional jazz repertoire, block chords, and trademark rhythmically independent, "singing" melodic lines continue to influence jazz pianists today. Unlike many other jazz musicians of his time, Evans never embraced new movements like jazz fusion or free jazz.