Cincinnati.com: Nick Lachey has added an incentive for the Greater Cincinnati singers he’ll direct on NBC’s “Clash of the Choirs.”

The 20-member choir will sing on his next album, if Cincinnati wins the five-city TV competition.

“That was my promise to them: If we win, we’ll do a song together. They can sing background on my album. I’ll bring them all in the studio,” says Lachey, who plans to release a new single early next year and an album in the spring.

Choir members were surprised, says Nick Wall, 20, of Green Township.

“At first we didn’t believe him,” says Wall, a 2006 Oak Hills High School graduate who sings at the First Baptist Church of Dent. “It would be unbelievable to be featured on his next album.”

Cincinnati Children’s Hospital Medical Center also will benefit from a victory. Lachey has designated the hospital’s neonatal intensive care unit to receive NBC’s cash prize for the winning city Thursday.

• Photos: Nick Lachey and his choir