Plácido Domingo, the superstar tenor who helped found Los Angeles Opera and has led it as general director since 2003, has renewed his contract with the company for an additional five years, through 2011. At the same time, the company announced Tuesday, artistic director Edgar Baitzel has been promoted to chief operating officer, and two new executives are coming on board… Although Domingo’s re-upping is no surprise, it underscores his pivotal role at Los Angeles Opera.”