There are numerous elements and ingredients that go into any theatrical performance, but some matter more than others.

Pittsburgh Opera launched its season Saturday with an almost excellent production of “La Boheme,” one of the most-performed operas in history. This performance had most of the trappings of a successful show: gorgeous period sets and costumes, an adored musical score brought to life with warmth and precision by a the orchestra, a lively chorus and a dynamic supporting cast.

The problem lay with the leads.

“La Boheme” — Italian for the Bohemians — is one of those slice-of-life tales of class and culture that resonates with any era. It begins simply: A group of friends devote themselves to the high ideals of art and philosophy and music rather than the mundane trappings of

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