PlayMakers Repertory Company opens its 2009-10 mainstage season with a behind-the-scenes look at the personal discordand professional harmony that compete for control of the world's finest string quartet. "Opus," by Michael Hollinger, a former concert violinist, will see its regional premiere at UNC's Center for Dramatic Art through Oct. 11. The play explores what happens when the most talented member of the ensemble goes missing, and a young woman is hired to take his place. Music enriches the drama, as it did in in PlayMakers' hit 2008 production of "Amadeus."BroadwayWorld.com called the show "smart, funny and ultimately shocking and downright breathtaking." Shows are at 8 p.m. Tuesdays through Saturdays, 2 p.m. on Oct. 3, and 2 p.m. Sundays. 962-PLAY (7529), www.playmakersrep.org.