Realbuto and Green previously accepted submissions for their Wunderkind songwriting competition, where writers are encouraged to submit original material to be performed at each stop on the Wunderkind tour.
Winners hear their song performed live in concert by Realbuto and Green.
"As a writer myself," Realbuto said in an earlier statement, "I know the importance of having your work performed live. Do you have any songs collecting dust in an old trunk somewhere? Do you want to test out a new song? Do you want to hear your song sung by a former Elphaba? Send me your songs and I will pick one to sing at each stop on my Wunderkind tour along with Wicked star Jenna Leigh Green."
Green is one of Realbuto's Oct. 13 guests alongsidge two-time Tony Award nominee Osnes (Cinderella, Bonnie and Clyde), Drama Desk nominee Christine Pedi (Chicago, Forbidden Broadway), Natascia Diaz (Man of La Mancha, Seussical), Laurissa Romain (South Pacific), Kimberly Faye Greenberg (Danny and Sylvia) and Realbuto's Ghostlight co-writer, Matthew Martin.
Rounding out the ensemble are David Colston Corris (Avenue Q), Julie D'Moure (C'est la Vie), Chris Jehnert (Hairspray), Thomas Ian Johnson, Justin Anthony Long ("City of Dreams") and Allison St. Rock (Bloody Bloody Andrew Jackson).