The incredible story of Los Xey, a musical group born in San Sebastián, Spain, in 1940, which achieved and maintained an extraordinary worldwide success until its dissolution in 1961.
| Directing | Eneko Olasagasti | Director |
| Directing | David Berraondo | Director |
| Production | David Berraondo | Producer |
| Camera | Joselu Castro | Director of Photography |
| Editing | Joselu Castro | Editor |
| Editing | Eneko Olasagasti | Editor |
| Production | María Eugenia Lombardi | Associate Producer |
| Production | José Ramón Pedroza | Associate Producer |
| Writing | David Berraondo | Writer |
| Writing | Eneko Olasagasti | Writer |
| Crew | Joselu Castro | Post Production Supervisor |
| Sound | Anartz Beobide | Sound Recordist |
| Sound | Haimar Olaskoaga | Sound Mixer |
| Sound | Haimar Olaskoaga | Sound Editor |
| Production | David Berraondo | Production Director |
| Production | David Berraondo | Researcher |
| Production | Elena Gozalo | Delegated Producer |
| Production | Rosa Pérez Roa | Executive Producer |