Criss surprised 4,000 youngsters at the festival, held this January in Atlanta, GA, and performed "Middle of a Moment" as well as "On Your Way Home" from James, which also features a book by Timothy Allen McDonald.
Click here to read more about Criss' experience at JTF 2015, and read our 8 Burning Questions with Broadway's next Hedwig here.
He will begin performances in the Tony-winning revival of Hedwig and the Angry Inch April 29.
Pasek, Paul and McDonald also announced that the James and the Giant Peach cast album is released as a permanently free download at JATGP.com. Read more about the cast album here.
Watch the exclusive video below!