Teaching McLin taught in Chicago at
Hubbard High School,
Harlan High School, and
Kenwood Academy. At Kenwood she taught
Mandy Patinkin, Deitra Farr, and
Kim English. R. Kelly stated that it was McLin that convinced him to pursue a career in music over basketball, that he considers McLin his "second mother", and that she has remained an influence in his career continuously since his high-school days. With her encouragement, R. Kelly wrote his first song, about poverty in Africa. McLin officially retired from teaching high school in the mid-1990s but continued teaching voice lessons. McLin published the book
Pulse: A History Of Music in 1977. She also has a library of choral works published by the
Neil A. Kjos Music Company.
Music McLin founded the McLin Ensemble in the 1950s, during which time she was serving as the public relations director of the Park District Opera Guild. She and the ensemble made their operatic debut in November 1960 at the Abraham Lincoln Center in Chicago, with a performance of
The Cloak. McLin and her husband Nathanael also founded the McLin Opera Company in the mid-1950s, funded with their own money. The company was named the "nation's leading small opera company" by the
Washington Afro-American in 1965. Under her direction the company performed on stage, as well as on radio and television networks. Her own opera,
Oh Freedom, was played at
Carnegie Hall in 1983. McLin composed a wide range of music, including
cantatas,
masses, and
rock operas. Her work has built from both European classical traditions and tradition African-American music, and "works large and small that, in essence, merged European and African-American languages", according to Reich. In all, she has composed more than 400 cantatas, masses, solo and choral arrangements of spirituals, anthems, art songs, gospel songs, rock operas, soul and pop songs, works for piano and orchestra, and electronic music arrangements, including
Free at Last: A Portrait Of Martin Luther King Jr. and
Gwendolyn Brooks: A Musical Portrait. ==Religious service==