by Paul E. RobinsonSUMMER MUSIC FESTIVALS 2010Aspen Music Festival and School After a few days in Vail enjoying the music-making of Jaap van Zweden and the Dallas Symphony at the Bravo! Vail Valley Music Festival, Marita and I drove over to Aspen, about 100 miles away through the mountains. What we found there was a much older community and a festival and school operating on an equally high artistic plane but with a more varied range of goals and activities. True, Aspen has been in the news lately for its administrative infighting which saw music director and conductor David Zinman…