Sentence:  Most important though is the fact that, for the first time in I can barely remember how long, the ROH mounts a new production of an Italian repertory <WSD>warhorse</WSD> that is fully on the level of the one it replaces [and indeed, in some respects, surpasses it] [...] we actually have a "Tosca". 
Meaning of the word marked with <WSD> tags:  A regularly revived theatrical or musical work, as with "Hamlet" or a Beethoven symphony, or as excerpts thereto. May imply that the work in question has become hackneyed.