This is going to be an excellent week for serious listeners of classical music, with several major events headlining the agenda and some other good concerts on the sidelines. In the spotlight are a piano recital, a visiting orchestra, Russian music, and possibly the greatest opera ever composed. HEADLINES: >> Pianist Murray Perahia had to cancel his 2006 recital for Washington Performing Arts Society, because of renewed pain from a finger injury in the 1990s…