Jamboree adheres to the usual formula of late-1950s rock & roll films: A plethora of musical numbers linked together by the wispiest of plotlines. Kay Medford heads the cast as manipulative showbiz agent Grace Shaw. Hoping to land pop singer Pete Porter, Grace connives to break up Pete's romance with female vocalist Honey Wynn. But who cares? The audience came to see such musical faves as Fats Domino, Count Basie, Jerry Lee Lewis, Jodie Sands, Ron Coby, Slim Whitman, Carl Perkins, Frankie Avalon, Charlie Gracie and the Four Coins. As a promotional tie-in, Jamboree also features appearances by 21 of North America's top rock-and-roll deejays.
| Actor | Role |
|---|---|
 Kay MedfordGrace Show | Grace Show |
 Paul CarrPeter Porter | Peter Porter |
| FFreda HollowayHoney Wynn | Honey Wynn |
| RRobert PasteneLew Arthur | Lew Arthur |
 Frankie AvalonFrankie Avalon | Frankie Avalon |
 Fats DominoFats Domino | Fats Domino |
 Dick ClarkHimself | Himself |
 Jerry Lee LewisJerry Lee Lewis | Jerry Lee Lewis |
 Carl PerkinsHimself | Himself |
 Cauby PeixotoDisc Jockey Ron Coby | Disc Jockey Ron Coby |
 Connie FrancisConnie Francis | Connie Francis |
| JJimmy BowenJimmy Bowen | Jimmy Bowen |
| BBuddy KnoxBuddy Knox | Buddy Knox |
 Count BasieCount Basie | Count Basie |
| CCharlie GracieCharlie Gracie | Charlie Gracie |
 Joe WilliamsJoe Williams | Joe Williams |
| JJodie SandsJodie Sands | Jodie Sands |
| SSlim WhitmanSlim Whitman | Slim Whitman |
| ZZenas SearsZenas Sears (Radio Host) | Zenas Sears (Radio Host) |
| DDick WhittinghillDick Whittinghill (Radio Host) | Dick Whittinghill (Radio Host) |
 Chris HowlandChris Howland (Radio Host) | Chris Howland (Radio Host) |
| HHoward MillerHoward Miller (Radio Host) | Howard Miller (Radio Host) |
| JJoe SmithJoe Smith (Radio Host) | Joe Smith (Radio Host) |