On disc-based video formats, an audio commentary is an additional audio track consisting of a lecture or comments by one or more speakers, that plays in real time with video. Commentaries can be serious or entertaining in nature, and can add information which otherwise would not be disclosed to audience members.^{[dead link]}

The DVD medium allows multiple audio tracks for each video program. DVD players usually allow these to be selected by the viewer from the main menu of the DVD or using the remote. These tracks will contain dialogue and sound of the movie, often with alternative tracks featuring different language dialogue, or various types of audio encoding (such as Dolby Digital, DTS or PCM). Among them may be at least one commentary track.

There are several different types of commentary. The two main types simply define the length of the commentary rather than the type of content. They are:

Typically a commentary track will include feature-length commentary from the film's director, cast members, or occasionally writers and producers. Occasionally actors will perform commentary in-character. (In recording sessions with multiple speakers, a designated moderator may encourage the discussion flow.) Some DVDs include outsider commentary performed by film critics, historians, scholars or fans. In more elaborate productions, multiple speakers from various recording sessions may be edited together for a single audio program.

Martin Charles Scorsese ( /skɔrˈsɛsɛ/; born November 17, 1942) is an American film director, screenwriter, producer, actor, and film historian. In 1990 he founded The Film Foundation, a non-profit organization dedicated to film preservation, and in 2007 he founded the World Cinema Foundation. He is a recipient of the AFI Life Achievement Award for his contributions to the cinema, and has won Academy Award, Palme d'Or, Emmys, Golden Globes, BAFTAs, and DGA Awards.

Scorsese's body of work addresses such themes as Italian American identity, Roman Catholic concepts of guilt and redemption,machismo, modern crime, and violence. Scorsese is hailed as one of the most significant and influential filmmakers of all time, directing landmark films such as Mean Streets (1973), Taxi Driver (1976), Raging Bull (1980), and Goodfellas (1990) – all of which he collaborated on with actor and close friend Robert De Niro. He won the Academy Award for Best Director for The Departed (2006), having been nominated a previous five times.

George Walton Lucas, Jr. (born May 14, 1944) is an American film producer, screenwriter, director, and entrepreneur. He is the founder, chairman and chief executive of Lucasfilm. He is best known as the creator of the space opera franchise Star Wars and the archaeologist-adventurer character Indiana Jones. Lucas is one of the American film industry's most financially successful directors/producers, with an estimated net worth of $3.2 billion as of 2011.

George Lucas was born in Modesto, California, the son of Dorothy Ellinore (née Bomberger) and George Walton Lucas, Sr. (1913–1991), who owned a stationery store.

Lucas grew up in the Central Valley town of Modesto and his early passion for cars and motor racing would eventually serve as inspiration for his USC student film 1:42.08, as well as his Oscar-nominated low-budget phenomenon, American Graffiti. Long before Lucas became obsessed with film making, he wanted to be a race-car driver, and he spent most of his high school years racing on the underground circuit at fairgrounds and hanging out at garages. However, a near-fatal accident in his souped-up Autobianchi Bianchina on June 12, 1962, just days before his high school graduation, quickly changed his mind. Instead of racing, he attended Modesto Junior College and later got accepted into a junior college to study anthropology. While taking liberal arts courses, he developed a passion for cinematography and camera tricks. George Lucas graduated from USC in California.