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)