Blue Monk Monk 1958 <br />Thelonious Sphere Monk (October 10, 1917 -- February 17, 1982) was a jazz pianist and composer. <br />He is known for his unique improvisational style and many contributions to the standard jazz repertoire, including his classic works "'Round Midnight" and "Blue Monk". Monk is often regarded as a founder of bebop although his playing style evolved away from the form. His compositions and improvisations often highlight rhythmic and spatial relationships rather than melody.