'Opera by Salieri is a four-letter term, ATAR. It is the title of an opera composed by Antonio Salieri, an Italian composer who was a rival of Wolfgang Amadeus Mozart. The opera was first performed in 1790 and is set in ancient Persia. It tells the story of Atar, a prince who is betrayed by his own brother and must fight to reclaim his throne. The opera is considered to be one of Salieri's most successful works and is still performed today.'