Lloyd Schwartz says that all the breathless speculation about James Levine’s health is much ado about nothing. “Levine’s BSO performances have demonstrated no apparent diminishment of energy or quality. He conducts sitting down, but he’s far from the only major conductor to do so… Several musicians from the Met orchestra, who refused to be named, claimed that the maestro gets tired toward the end of five- or six-hour Wagner operas. Well, duh! — who wouldn’t? But has it hurt any performances? … Is this front-page news? Musicians who were happy to be identified, both from the Met and from the BSO, had nothing but praise for Levine’s musicianship, conducting technique, and energy level.”