San Francisco Opera, which just inaugurated its centenary season with the world première of John Adams's Antony and Cleopatra, is also offering what looks to be a riveting series of archival streams. Up now are offerings on a Slavic theme: Jenůfa with Elisabeth Söderström (1980), Lady Macbeth of Mtsensk with Anja Silja (1981), and excerpts from a 1945 Boris Godunov with Ezio Pinza.
