I was there in '94 so it's hard to remember but I don't think there was any singing, just a play telling the story of the last week of Christ's life. Also at the Passion Play grounds there are different displays (Rhonda, help me out here!!). There is a recreatiion to scale of the Tabernacle of the book of Exodus, a museum of bible works and a tour of different sights of biblical times. There is a huge statue of Christ with open arms called The Christ of the Ozarks. It's awesome. Eureka Springs is an amazing little town with Victorian style homes and the landscape is breathtaking, love the hills, lol.
I definately recommend a visit. I would love to return someday.