Donald Johnson Ellis was an American jazz trumpeter, drummer, composer, and bandleader. He is best known for his extensive musical experimentation, particularly in the area of time signatures. Later in his life he worked as a film composer, contributing a score to 1971's The French Connection and 1973's The Seven-Ups.

The French Connection is a 1971 American neo-noir action thriller film directed by William Friedkin and starring Gene Hackman, Roy Scheider and Fernando Rey. The screenplay, written by Ernest Tidyman, is based on Robin Moore's 1969 non-fiction book of the same name. It tells the story of fictional NYPD detectives Jimmy "Popeye" Doyle and Buddy "Cloudy" Russo, whose real-life counterparts were narcotics detectives Eddie Egan and Sonny Grosso, in pursuit of wealthy French heroin smuggler Alain Charnier.