O Filii, from Twelve Chorale Preludes on Gregorian Chant Themes, Op. 8 -- Jeanne Demessieux (1921-1968) Title: O FiliiExcerpted from: Twelve Chorale Preludes on Gregorian Chant ThemesOpus No.: O FiliiComposer(s): Jeanne Demessieux (1921-1968)