Miles Teller
as Andrew

J.K. Simmons
as Fletcher

Paul Reiser
as Jim

Melissa Benoist
as Nicole

Austin Stowell
as Ryan

Nate Lang
as Carl

Chris Mulkey
as Uncle Frank

Damon Gupton
as Mr. Kramer

Suanne Spoke
as Aunt Emma

Max Kasch
as Dorm Neighbor

Charlie Ian
as Dustin

Jayson Blair
as Travis

Kofi Siriboe
as Bassist (Nassau)

Kavita Patil
as Assistant - Sophie

C.J. Vana
as Metz

Tarik Lowe
as Pianist (Studio Band)

Tyler Kimball
as Saxophonist #2 (Studio Band)

Rogelio Douglas Jr.
as Trumpeter #1 (Studio Band)

Adrian Burks
as Trumpeter #2 (Studio Band)

Calvin C. Winbush
as Saxophonist (Studio Band)

Joseph Bruno
as Technician (Overbrook) - Mike

Michael D. Cohen
as Stage Hand (Overbrook)

Jocelyn Ayanna
as Passerby (Bus Station)

Keenan Henson
as Truck Driver

Janet Hoskins
as Passerby (Dunellen)

April Grace
as Rachel Bornholdt

Clifton 'Fou Fou' Eddie
as Drummer (Quartet)

Marcus Henderson
as Bassist (JVC)

Tony Baker
as Stage Hand (Carnegie Hall)

Henry G. Sanders
as Red Henderson

Sam Campisi
as Andrew (8 years old)

Jimmie Kirkpatrick
as Nassau Trumpeter #2

Keenan Allen
as Studio Core Member #1

Ayinde Vaughan
as Studio Core Member #2

Shai Golan
as Studio Core Member #3

Yancey Wells
as Studio Core Member #4

Candace Roberge
as Student #1

Krista Kilber
as Student #2

Stephen Hsu
as JVC Guitarist (uncredited)

Herman Johansen
as Music Competition Judge (uncredited)

Wendee Lee
as Audience Member (uncredited)

Joseph Oliveira
as Bartender (uncredited)

Michelle Ruff
as Audience Member (uncredited)

Daniel Weidlein
as Studio Band Saxophone Player (uncredited)