It is quite a bold thing to reimagine a film as widely beloved and praised as 1984’s Academy Award-winning “ Amadeus .” Starz ’s latest historical drama, “Amadeus,” is based on Peter Shaffer‘s 1979 play of the same name (which was inspired by Alexander Pushkin’s 1830 play “Mozart and Salieri”) and adapted to television by Joe Barton. The limited series (which debuted last year in the U.K. on Sky Atlantic) is an extravagant, decidedly modern retelling of the fictionalized rivalry between composers Wolfgang Amadeus Mozart ( Will Sharpe ) and Antonio Salieri (an outstanding Paul Bettany ). And the show is beautifully rendered. Unfortunately, overextending the tale into a five-hour-long television show dilutes the tension, genius and the music that made the film and Shaffer‘s play such masterpieces. ​ “Amadeus” begins in a darkened room with a confession. An ailing Salieri confesses to Mozart’s widow, Constanze (Gabrielle Creevy), that he murdered the prolific musician some 30 years prior.…