Thelonious Monk (1917-1982), "was American jazz pianist and composer considered one of the giants of American music.[He] had a unique improvisational style and made numerous contributions to the standard jazz repertoire" Source: Wikipedia
Shirley Scott (1934 – 2002) was a hard bop and soul-jazz organist. She was most known for working with her husband, Stanley Turrentine, and with Eddie "Lockjaw" Davis. She was known as 'Queen of the Organ.