ABC Players present Peter Shaffer’s acclaimed drama “Amadeus,” from Sept. 11-13 at the historic Stuart’s Opera House in Nelsonville. Set in 18th-century Vienna, “Amadeus” explores the complicated relationship between court composer Antonio Salieri and the brilliant but unconventional Wolfgang Amadeus Mozart. As Salieri confronts his envy of Mozart’s extraordinary talent, the play delves into questions of faith, ambition, jealousy and the cost of artistic greatness.