Jay DeMarcus of Rascal Flatts to publish debut memoir with Zondervan Sing On to Release April 2019 Grand Rapids, Mich., July 30, 2018 – Zondervan announced today a book contract with Jay DeMarcus, bassist, vocalist, pianist, producer and songwriter for the superstar vocal group Rascal Flatts. DeMarcus is represented by Kathy Armistead Olen with Atticus Brand Partners and world rights were acquired by Zondervan associate publisher Stephanie Smith and Matt Baugher, senior v-p of author and partnership development for HarperCollins Christian Publishing.  “I’m really looking…