This Trisagion, or Trisvetoe in C-Slavonic language, is sung during Liturgy on Good Friday, in Greek and Slavonic. The chant is called "Glagolitic chant". It is a folk chant with much less artistic value and complexity than psaltiki or gregorian chant, but, according to the researchers, it has elements of both of them. Recorded in 2010, on island Veli Iž, Croatia.