and music director, effective with the 2008/09 season, with an initial contract for three years. The appointment was unusual in that Nelsons had conducted the CBSO only in a private concert and in a recording session, without a public concert engagement, prior to being named to the post. His first public conducting appearance with the CBSO was on 11 November 2007 in a matinee concert, and his first subscription concert appearance with the CBSO was in March 2008. In July 2009, Nelsons extended his CBSO contract for an additional three years, through the 2013/14 season. In August 2012, the CBSO announced the extension of his CBSO contract formally through the 2014/15 season, and then for subsequent seasons on the basis of an annual rolling renewal. In October 2013, the CBSO announced the conclusion of Nelsons's tenure as music director after the end of the 2014/15 season. Boston Symphony Orchestra 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. Nelsons held the title of Music Director Designate in the 2013/14 season. In August 2015, the BSO announced the extension of Nelsons's contract as music director through the 2021/22 season with a new contract, for eight years, that replaced the initial five-year contract, and also contained an evergreen clause for automatic renewal. In October 2020, the BSO announced a further extension of Nelsons' contract as music director through August 2025, with an evergreen clause for automatic renewal. Leipzig Gewandhaus Orchestra Nelsons first guest-conducted the Leipzig Gewandhaus Orchestra in 2011. In September 2015, the orchestra announced the appointment of Nelsons as its next Gewandhauskapellmeister, effective with the 2017–2018 season, with an initial contract of 5 seasons. In October 2020, the orchestra announced the most recent extension of his contract as Gewandhauskapellmeister through 31 July 2027. Recording history With the CBSO, Nelsons has recorded music of Pyotr Ilyich Tchaikovsky, Richard Strauss, and