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Thelonious Sphere Monk was born two years after his sister Marion on October 10, 1917, in Rocky Mount, North Carolina, and was the son of Thelonious and Barbara Monk. His badly written birth certificate misspelled his first name as "Thelious" or "Thelius." It also did not list his middle name, taken from his maternal grandfather, Sphere Batts. A brother, Thomas, was born in January 1920.

In 1947, Ike Quebec introduced Monk to Lorraine Gordon and her first husband, Alfred Lion, the founder of Blue Note Records. From then on, Gordon preached his genius to the jazz world with unrelenting passion. Shortly after meeting Gordon and Lion, Monk made his first recordings as the Coleman Hawkins Quartet leader for Blue Note (later anthologized on Genius of Modern Music, Vol. 1), which showcased his talents as a composer of original melodies for improvisation. Monk married Nellie Smith the same year, and in 1949 the couple had a son, T. S. Monk (called Toot), who became a jazz drummer. A daughter, Barbara (affectionately known as Boo-Boo), was born in 1953 and died of cancer in 1984.  In her autobiography, Gordon spoke of the utter lack of interest in Monk's recordings, which translated to poor sales. "I went to Harlem and those record stores didn't want Monk or me. I'll never forget one particular owner, I can still see him and his store on Seventh Avenue and 125th Street. 'He can't play lady, what are you doing up here? The guy has two left hands.' 'You just wait,' I'd say. 'This man's a genius, you don't know anything.'"  Due to Monk's reticence, Gordon became his mouthpiece to the public. In February 1948, she wrote to Ralph Ingersoll, the editor of the newspaper PM, and described Monk as "a genius living here in the heart of New York, whom nobody knows." As a result, one of PM's best writers visited Monk to do a feature on him, but Monk wouldn't speak to the reporter unless Gordon was in the room with him. In September of the same year, Lorraine approached Max Gordon, the owner and founder of the Village Vanguard jazz club, and secured Monk his first gig there. Monk was showcased at the club for a week, but not a single person came.  In August 1951, New York City police searched a parked car occupied by Monk and his friend Bud Powell. They found narcotics in the car, presumed to have belonged to Powell. Monk refused to testify against his friend, so the police confiscated his New York City Cabaret Card. Without this, Monk was unable to play in any New York venue where liquor was served, and this severely restricted his ability to perform for several years. Monk spent most of the early and mid-1950s composing, recording at Blue Note, and performing at theaters and out-of-town gigs.
Thelonious Monk