We celebrate Easter Sunday (Maundy Thursday, Good Friday and Holy Saturday) during Holy Week, which is marked by the singing of the Dawn Vigil in the monasteries before dawn. In the 16th and 17th centuries, it was called "Twilight" (Latin: Tenebrae). For centuries, the days and hours of Christ's Passion and the hours leading up to the Resurrection were accompanied by hymns. These have changed over time, from Gregorian chant, to polyphonic, to contemporary music, but their liturgical significance has remained. Jonas Vilimas, a scholar of Gregorian chant manuscripts and traditions, will present the religious meaning of Holy Week to the audience, and the Aidija Choir will sing musical examples of the changing music that accompanied it. 

Aidija Chamber Choir was founded in 1989 at the Mikolas Konstantinas Čiurlionis School of Arts, on the initiative of professor Romualdas Gražinis. The repertoire of the ensemble, which actively performs, consists of music from Gregorian chant to works by 21st century composers. The choir has organised educational-musical programmes in cooperation with the Church Heritage Museum, and since 2014 it has been carrying out a lecture-concert project Musica sacra, presenting masterpieces of 14th-21st century church music, as well as contemporary sacred works by Lithuanian and foreign composers.    

Jonas Vilimas is a Doctor of Humane Letters, a musicologist, a lecturer at the Lithuanian Academy of Music and Theatre, the director and one of the founders of the Vilnius University's Gregorian Choir "Schola Gregoriana Vilnensis".