[2] His Canticum Canticorum I, written for the Hilliard Ensemble and premiered in 1987, achieved enormous success and remains his most frequently-performed work,[3] and in 1990 he won the Arts for the Earth Festival Prize for Prayer for the Forests, subsequently premièred by the renowned Tapiola Choir of Finland.
One of his most important works is the oratorio Passion and Resurrection (1992), based on Orthodox liturgical texts, premièred in 1993 by Red Byrd and the Estonian Philharmonic Chamber Choir under Tõnu Kaljuste at the Tampere Festival.
Other significant works include the 'cello concerto Epitaphios (1993), the cantata Revelation (1995), Endechas y Canciones (1996), the recorder concerto Pnevma (1998), Lamentations of the Myrrhbearer (2001) for string quartet, Lumière sans déclin (2000) for string orchestra, and the choral triptych written for Trio Mediaeval - Words of the Angel (1998), Troparion of Kassiani (1999), A Lion's Sleep (2002), and Chalice of Wisdom, using a text from Matins of the Feast of St Thomas, written in 2002 for the ensemble amarcord.
Later compositions include a large-scale BBC commission, The Dormition of the Virgin (2003), concertos for double-bass (The Morning Star, 2003), piano (Linnunlaulu, 2003) and bassoon (Arise, 2004), Passione Popolare, built on popular religious texts from Magna Graecia and premièred at the Antidogma Festival in Italy in June 2005, and Ossetian Requiem, written for the Amsterdam-based 'Cello Octet Conjunto Ibérico.
In 2008, he completed a new work for the King's Singers, "Canti della Rosa" and a large-scale setting of the Stabat Mater, incorporating texts from the Byzantine liturgy and by Anna Akhmatova, for the Oslo International Festival of Church Music.
2011 saw the completion of a sequence of music for Byzantine-rite vespers for the Children's Choir of St Vladimir's Orthodox Theological Seminary in New York and Ode 8 of the Paschal Canon, part of a multi-composer work commissioned by Cappella Romana.