Some rough-and-tumble opening chords can mean only one thing to opera lovers - Puccini’s La Boheme. The iconic work is back in Philadelphia for what could feel like the 300th time since first arriving here 114 years ago. Audiences rarely tire of the story of starving artists in 19th-century Paris, or the famous arias that convey the rapture of young love. But they might also feel like it’s a rerun.