Freddie Highmore
August Rush
Keri Russell
Lyla Novacek
Jonathan Rhys Meyers
Louis Connelly
Terrence Howard
Richard Jeffries
Robin Williams
Maxwell "Wizard" Wallace
William Sadler
Thomas Novacek
Marian Seldes
The Dean
Mykelti Williamson
Reverend James
Leon Thomas III
Arthur
Aaron Staton
Nick
Alex O'Loughlin
Marshall
Jamia Simone Nash
Hope
Ronald Guttman
Professor
Bonnie McKee
Lizzy
Michael Drayer
Mannix
Jamie O'Keeffe
Steve
Becki Newton
Jennifer
Tyler McGuckin
Peter
Megan Gallagher
Megan
Anais Martinez
Backbeat
Bilal Bishop
Roller Bull
Michael R. Hammonds II
Feedback
Timmy Mitchum
Joey
Henry Caplan
Bill
John Knox
Club Manager
Amy V. Dewhurst
Receptionist
Victor Verhaeghe
Cop
Darrie Lawrence
Old Neighbor
Sean Haberle
Frank
Jamal Joseph
Driver
Robert Aberdeen
Record Executive
Georgia Creighton
Apartment Owner
Joshua Jaymz Doss
Orphanage Kid
Craig Johnson
Orphanage Boy
Dominic Colón
Policeman
Zach Page
Child Guitar Player
Charles Mack
Gospel Soloist
Amma Agyapon
Gospel Singer
Adia Beckford
Gospel Singer
Dietrice A. Bolden
Gospel Singer
Dina Gardener
Gospel Singer
Luther Isler
Gospel Singer
Raymond Johnson
Gospel Singer
Joyce Walker Joseph
Gospel Singer
Willana Mack
Gospel Singer
Lamar Antwon Robinson
Gospel Singer
Talif Showers
Gospel Singer
Carlton Taylor
Gospel Singer
Yvette Bodrick
Street Sound Circle
Crystal A. Elliott
Street Sound Circle
Jindai Joseph
Street Sound Circle
Jacquelen Singleton
Street Sound Circle
Travis Veada
Street Sound Circle
Jasmine Pauline Wigfall
Street Sound Circle
John Farrer
Violinist (uncredited)