Comtra Theatre, Route 19 in Cranberry Township, presents “Harps and Harmonicas” Friday through Oct. 29. Curtain is at 7:30 p.m. Fridays and Saturdays. Tickets are $15. Call 724-773-9896.

<B>New Castle Playhouse</B>, 212 E. Long Ave., New Castle, presents the musical “Rent” Friday through Oct. 30 in the Annex Theatre. Curtain is at 7:30 p.m. Fridays and Saturdays and 2 p.m. Sundays. Tickets are $12. Call 724-654-3437.

<B>Quantum Theatre</B> is staging its world premiere Karla Boos adaptation of Graham Greene’s “The End of the Affair” through Oct. 30 at the former Emma Kaufmann Clinic, 3028 Brereton St. in Polish Hill. Curtain is at 8 p.m. Wednesdays through Saturday and at 7 p.m. Sundays. Tickets are $35 to $48; students pay $18. Call 888-718-4253 or visit www.quantumtheatre.com.