There is nothing more to be said than simply “press play”. Everything else will work itself out once Jennifer Holliday opens up that mouth and sings the show stopping ballad that no one else has ever even come close to matching the force that is her portrayal of Effie Melody White.
http://www.youtube.com/watch?v=RCDDx2JFnaQ
P.S. Look at how snatched Loretta Devine was in 1982.