(Percussionists: Get “Six by Six” for only $6 or £6 just this weekend, during the McCormick Marimba Festival!) The orchestra world (particularly in the USA) is currently rife with intrigue, politics, passionate zealots and somewhere in the midst… great music. Over the past few weeks there have been some interesting observations touching on the borders of three particular topics, and not being one for averting the unpopular or difficult, I shall name them right here, right now: Keep the penguins? Nostalgia. What makes music beautiful? There we have it. I’m serious. OK, so the titles themselves may not ring any bells with you, but let me explain: Penguins. As in,…