As everyone even peripherally aware of the world of classical music knows, 2006 is the 250th anniversary of Mozart’s birth. It’s also the 100th for Shostakovich, and you probably knew that, too. But two other influential composers would have been celebrating a century this year, and no one seems to care a bit. How could this be so, in an industry so in love with anniversary celebrations? Well, for one thing, they were both women. Beyond that, “there are, as you might suspect, a clutch of personal reasons, along with a whiff of scandal.”