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In the US, Nelsons made his first guest-conducting appearance with the Boston Symphony Orchestra (BSO) in March 2011, as an emergency substitute for James Levine at Carnegie Hall. He subsequently guest-conducted the BSO at the Tanglewood Music Festival in July 2012, and made his first appearance with the BSO at Symphony Hall, Boston in January 2013. In May 2013, the BSO named Nelsons as its 15th music director effective the 2014/15 season. His initial contract was for 5 years and stipulated 8 to 10 weeks of scheduled appearances in the first year of the contract and 12 weeks in subsequent years.