The 15th-century Easter hymn "O Filii et Filiae" is a traditional Gregorian chant that tells the story of Christ's Resurrection and his appearance to the disciples. It is often performed in long-form meditation or devotional videos, with popular versions by Patrick Lenk offering hours of continuous, meditative, and, for many, deeply moving chant. O Filii Et Filiae – Patrick Lenk Music
You can find the full lyrics and English translation at: O Filii et Filiae - Patrick Lenk Music Gregorian Chant Hymns Wikisource The 15th-century Easter hymn "O Filii et Filiae"