Truth be damned! Playwright Peter Shaffer didn’t make any grand effort to stick to the facts for his 1979 masterstroke, “Amadeus,” and we thank him for that. The Catholic guilt and rage for revenge seething underneath Antonio Salieri’s powdered wig is much more interesting than any quiet courtly tiffs. And the chance to see Wolfgang Amadeus Mozart acting more like his Van Halen namesake than a regal composer is reason enough to see the play. Shaffer, the poison pen behind “Equus” and “Lettice and Lovage,” knows how to find comedy in the dark, and “Amadeus” has laughs amidst the jealousy and pain. Jeannine Haas directs for The Theater Company at Hubbard Hall. 8 p.m. Friday and Saturday; 2 p.m. Sunday, Hubbard Hall, 25 E. Main Street, Cambridge, 677-2495, $15-$25. Through May 27.