[1] Death Whistles the Blues development dates back to at least May 1961, when director Jesús Franco was working with Sergio Newman.

The film was produced the following year by Nazario Belmar, the ex-football player for Real Madrid CF.

[4] Death Whistles the Blues was released on Blu-ray by Severin Films as a double feature with Rififi in the City (1964).

[5] Film historians Roberto Curti and Francesco Cesari said that generally, Death Sings the Blues was critically regarded as something different and culturally more important than Franco's previous output as a director.

[7] Cineinforme declared the film a "bad Spanish concoction of mystery and vengeance, made without artistic ambitions and with an obvious lack of means.