A re-evaluation of the great composer and musician, Seán Ó'Riada, of whom the poet Thomas Kinsella said: "It is not often that a single person, however gifted, can alter the character of a nation's culture. Ó Riada managed to do this..." This film tells the story of Ó Riada's life and work, using the composer's own words as transcribed from various writings, lecture notes and tapes.