A great day in Harlem tells the story of Art Kane's famous 1958 group photograph of the jazz greats of the period. Includes home movie footage of that day of the musicians arriving and greeting each other the morning of the shoot. Also includes conversations with musicians and archival performance footage.

Filmed at the 1958 Newport Jazz Festival in Rhode Island and directed by world-renowned photographer Bert Stern, Jazz on a Summer's Day features intimate performances by an all-star line-up of musical legends including Louis Armstrong, Thelonious Monk, Gerry Mulligan, Anita O'Day, Chuck Berry, Dinah Washington, and closes with a beautiful rendition of The Lord's Prayer by Mahalia Jackson at midnight to usher in Sunday morning.