Musicians to Rock 'Papalpalooza' for Pope Benedict

In a convergence of religious experience and rock festival, some of the top acts in Christian music will perform at a youth rally on Saturday as part of Pope Benedict XVI's U.S. visit.

Third Day, Matt Maher, Salvador and tobyMac are scheduled to perform in Yonkers, N.Y., at St. Joseph Seminary. Inaugural "American Idol" champion Kelly Clarkson was also slated.

"St. Joseph is a beautiful, historic seminary campus -- one of the most important seminaries in the country," says event producer Chris Wangro, president of New York-based Zaragunda.

"We've been building here for over a week. It's a giant setup -- it's a reconfigured stage once used for the Rolling Stones. The site is about 50 acres, and we've covered every inch of it with production needs. We're calling it 'Papalpalooza.' "