James Levine starts his first summer leading the Tanglewood Festival. “Everyone expects Tanglewood to be transformed in the Levine era, but no one knows yet what direction the changes will take. Levine has been at the Boston Symphony Orchestra’s summer home, festival, and school only twice before, as an audience member in 1956, when he was 13, and as a guest conductor in 1972. He’s been careful to say that he needs to experience the way Tanglewood does things before thinking about making changes. Change is one of the things Tanglewood is supposed to be about.”