Garry Walker succeeded Alsop as principal guest conductor, serving from 2003 to 2007. Stéphane Denève was music director of the RSNO from 2005 to 2012. During his tenure, the RSNO recorded music of Debussy and of Albert Roussel, the latter for Naxos Records. In January 2011, the RSNO announced the appointment of Peter Oundjian as its next music director, as of the 2012–2013 season, with an initial contract of 4 years. In October 2011, Thomas Søndergård was named the orchestra's principal guest conductor, as of the 2012–2013 season, with an initial contract of 3 years for 3 programmes per year. In 2015, the orchestra took up new residence at the RSNO Centre and Glasgow Royal Concert Hall. The RSNO's current assistant conductor is Holly Mathieson, since September 2016. Oundjian is scheduled to conclude his tenure as RSNO music director after the close of the 2017–2018 season. In May 2017, the RSNO announced the appointment of Søndergård as its next principal conductor, effective with the 2018-2019 season. In June 2017, the RSNO appointed Elim Chan as its next principal guest conductor, effective 2018, following her first guest-conducting appearance with the RSNO in January 2017 and a return engagement a fortnight later as an emergency substitute for Neeme Järvi. In December 2018, the RSNO announced the appointment of Alistair Mackie as its next chief executive, effective April 2019. The affiliated choruses of the RSNO are the RSNO Chorus and the RSNO Junior Chorus. The RSNO Chorus evolved from a choir formed in 1843 to sing the first full performance of Handel's "Messiah" in Scotland, in April 1844. In addition to its commitment to the RSNO, the Chorus performs independently and has toured worldwide. The current chorus director is Gregory Batsleer. In 1978, Jean Kidd formed the RSNO Junior Chorus. Since 1994, its director has been Christopher Bell. The RSNO Junior Chorus has a membership of around 400 singers, aged from eight to eighteen. The members learn to sing using the Kodály method. The orchestra has had a long-standing recording contract with Chandos Records, particularly in the 1980s and 1990s. The RSNO has also recorded for Naxos Records, most notably in a cycle of Anton Bruckner symphonies with the Georg Tintner, cycles of Arnold Bax symphonies with David Lloyd-Jones, and several recordings of American works (including the complete orchestral works of Samuel Barber) conducted by Marin Alsop.