‘Too many notes!’ the Emperor Joseph tells Mozart. So much for His Majesty’s musical judgement. Porchlight Music Theatre Chicago tackles Peter Shaffer’s Amadeus, about Mozart and his nemesis/assassin Antonio Salieri, by engaging opera singers to perform the opera scenes rather than talk around them. You know, more like the movie, minus all the bizarre Milos Forman and Twyla Tharp dash. At Porchlight, one can count on the good taste of director L. Walter Stearns and musical director Eugene Dizon. Amadeus runs through May 9 at Theatre Building, 1225 W. Belmont; $25; (773) 327-5252.