And I'm Telling You::Jennifer Holliday

http://youtube.com/watch?v=kC_u_q-iND0

Dreamgirls is a Broadway musical, which opened on December 20, 1981 at the Imperial Theatre. Dreamgirls won six Tony Awards in 1982, and closed on August 11, 1985 after four years and 1,522 performances.
The cast recording won two Grammy awards, Best Musical Album and Best Vocal Performance for Jennifer Holliday's "And I Am Telling You I'm Not Going".
(Wikipedia)