audio commentary
nounDefinition of audio commentary
: spoken commentary accompanying a performance or visual presentation
especially
: commentary relating to the making of a movie that is recorded by the movie's director or members of its cast and that can be listened to while watching the movie on DVD
For the DVD, Reeves offers some insights into making his story work in his audio commentary … — George Lang, The Oklahoman (Oklahoma City, Oklahoma), 21 Jan. 2011