This is a composition of mine from around 2006 or so. It is a SSA trio of the exaposteilarion of Great and Holy Friday, in the Slavonic style, and using a translation from the Slavonic rather than the Greek (the Slavonic version interposes the word “wise,” for example). The hymn is appointed to be sung three times. Since the 19th century, it has been a common Russian practice that at least one of these repetitions should be done as a trio, hence the present version.
I’ve never heard of any parish actually performing this piece liturgically.