The first thing you need to know about Monk is that he has a crazy name. Thelonious Sphere Monk. That is his birthname. He was born October 10, 1917 in Rocky Mount, North Carolina, the son of Thelonious and Barbara Monk, two years after his sister Marian. A brother, Thomas, was born a couple of years later. In 1922, the family moved to 243 West 63rd Street, in Manhattan. Monk started playing the piano at the age of six. Although he had some formal training and eavesdropped on his sister's piano lessons, he was essentially self-taught. Monk attended Stuyvesant High School, but did not graduate. He briefly toured with an evangelist in his teens, playing the church organ, and in his late teens he began to find work playing jazz.
The second thing you need to know about him is that he is one of the most important jazz composers of all time. In a few words, his reputation was for crafting really eccentric and oddball pieces which, once you got a little way through them, were immensely beautiful. His solos were pretty simplistic, frequently being comprised of just a variation on the melody and some little tinkling lines. Yet, listening to it, you can tell he’s got a very strong idea of what he wants to portray—he just does it differently from almost every other soloist.