Taking some of the medieval chants he had rediscovered , Tjeknavorian composed the vocal work '' Life of Christ '' , first performed during the Festival at the Queen Elizabeth Hall by the Ambrosian Singers . Many of Tjeknavorian 's most important compositions were written in this fruitful and personally difficult ten-year period culminating with , and immediately following , the Iranian Revolution in 1979 . Foremost among his works during this time are his Second Symphony ( Credo ) and the oratorio '' The Book of Revelations '' , the second and third parts respectively of his trilogy on the Armenian Genocide begun with his groundbreaking First Symphony ( Requiem for the Massacred ) scored for trumpet and percussion and released in London by Unicorn in 1976 . Another key work towards the end of this period was his ballet '' Othello '' , commissioned by the Northern Ballet Company and premiered in London in 1985 with Princess Ann in attendance . The recording of the piece released that year on EMI with the London Symphony Orchestra was praised by Gramophone as " enormously effective " ( Gramophone , November 1985 )
Armenian Genocide
Armenian Genocide
Loris Tjeknavorian