By COLLEEN BARRY MILAN (AP) — Soprano Lisette Oropesa was to be the first American to sing a title role in the gala season opener at La Scala since Maria Callas in the 1950s. Then Italy’s virus cases surged. An outbreak in both La Scala’s chorus and its orchestra forced the country’s premier opera house to cancel for the first time one of the top events on Europe's cultural calendar. Oropesa is now