cast
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Freddie Highmore
August Rush
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Keri Russell
Lyla Novacek
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Jonathan Rhys Meyers
Louis Connelly
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Terrence Howard
Richard Jeffries
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Robin Williams
Maxwell "Wizard" Wallace
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William Sadler
Thomas Novacek
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Marian Seldes
The Dean
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Mykelti Williamson
Reverend James
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Leon Thomas III
Arthur
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Aaron Staton
Nick
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Alex O'Loughlin
Marshall
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Jamia Simone Nash
Hope
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Ronald Guttman
Professor
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Bonnie McKee
Lizzy
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Michael Drayer
Mannix
- Jamie O'Keeffe Steve
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Becki Newton
Jennifer
- Tyler McGuckin Peter
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Megan Gallagher
Megan
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Anais Martinez
Backbeat
- Bilal Bishop Roller Bull
- Michael R. Hammonds II Feedback
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Timmy Mitchum
Joey
- Henry Caplan Bill
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John Knox
Club Manager
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Amy V. Dewhurst
Receptionist
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Victor Verhaeghe
Cop
- Darrie Lawrence Old Neighbor
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Sean Haberle
Frank
- Jamal Joseph Driver
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Robert Aberdeen
Record Executive
- Georgia Creighton Apartment Owner
- Joshua Jaymz Doss Orphanage Kid
- Craig Johnson Orphanage Boy
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Dominic Colón
Policeman
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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
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John Farrer
Violinist (uncredited)