Is Meredith Monk related to Thelonious Monk?

No, certainly not. They just happen to have the same last name

Monk attended Stuyvesant High School, but did not graduate.

Piano

His nicknames were Melodious, The Mad Monk, The High Priest of Bebop, or The Genius of Modern Music.

Thelonious Monk died on February 17, 1982 at the age of 64.