to the works of Bach, Koopman has long been an advocate of the music of Bach's teacher and predecessor, Dieterich Buxtehude. He had previously recorded the keyboard works for Philips Classics and several cantatas for Erato. He was elected president of the "International Dieterich Buxtehude Society" in 2004. Following the completion of the Bach cantatas project Koopman then embarked on a recording of the complete works of Buxtehude. In 2005 he commenced Dieterich Buxtehude – Opera Omnia, a project to record the complete works of Dieterich Buxtehude, which he finished in October 2014. Other projects Besides his work with the Amsterdam Baroque Orchestra & Choir, he is in frequent demand as guest conductor and as harpsichordist and organist. In 2011, Koopman began a three-year stint as artist-in-residence with the Cleveland Orchestra. His aim is always to achieve authenticity in performance, using historical instruments from the time of the composer, and/or exact copies of them, often using historic musical temperaments, and adopting the performing style of the composers or their contemporaries. The scholar (and fellow keyboardist/conductor) John Butt has criticised Koopman's interpretation of Bach's Goldberg Variations for its overuse of ornamentation, which he attributes to a desire to differentiate his interpretation from those of Gustav Leonhardt. Personal life Koopman is married to Tini Mathot, who is also a harpsichordist and fortepianist, and the two frequently perform together. Mathot is also his chief recording producer, as well as a teacher at the Royal Conservatory. On 11 October 2012 the documentary Live to be a hundred – a year in the life of Ton Koopman was released in Dutch cinemas. Discography Koopman's extensive discography includes the complete Bach cantatas and organ works, St Matthew Passion (twice) and St John Passion, Mass in B minor, Christmas Oratorio, a recording of his own reconstruction of the lost St Mark Passion, concertos and harpsichord works by Bach, Sweelinck's complete keyboard works, the complete works of Buxtehude, Haydn's complete harpsichord concertos, Mozart's Coronation Mass, Vespers and Requiem, a cycle of Mozart and Haydn symphonies, Mozart's early keyboard works K. 1a-5 and Mozart's 3 Harpsichord Concertos after J.C. Bach, K. 107. He conducts 8 soloists, Nancy Zijlstra, Barbara Schlick, soprano, Klaus Mertens, Peter Kooij, bass, Dominique Visse, Kai Wessel, countertenor, Christoph Prégardien, Harry Van Berne, tenor and The Amsterdam Baroque Orchestra for « Les Motets à double Chœur » H.403, H.404, H.135, H.136, H.137, H.392, H.410, H.167 by