This month, we’ve some virtuoso pianola, Bruckner and Chopin get downsized, and there’s some full-fat Mahler. Rare American orchestral works rub shoulders with Mozart, and a Russian conductor gives his final performance. A British pianist tackles Ravel, and a Danish accordion player seeks Slavic inspiration. Brass players from San Francisco take on contemporary music, and Trio Mediaeval revive 13th-century polyphony from Worcester. And a young Norwegian brings Grieg to vivid life.