<cite>Dreamgirls</cite> takes a turn at Harlem's Apollo, by Linda Winer
How smart to kick off a new touring revival of <cite>Dreamgirls</cite> with a few weeks at the Apollo Theater. Of course, both the 1981 show and the 2006 movie begin with a talent contest at the legendary Harlem landmark, which for 75 years has been introducing newcomers and showcasing stars through the ups and downs of West 125th Street. With a gifted company of virtual unknowns, the musical plays with and within th…