Solemnis Karita Mattila (soprano), Catherine Wyn-Rogers (mezzo), Herbert Lippert (tenor), Anthony Michaels Moore (baritone), BBC Singers, BBC Symphony Chorus and Orchestra, conductor Bernard Haitink Stephen Jackson's last concert with the BBC Symphony Chorus was part of the Barbican's Sound Unbound event on Saturday 31 October 2015, and included Judith Bingham's The Spirit of Truth and "the Mount Everest of classical choral music: the glorious 40-part motet", Thomas Tallis's Spem in alium. This is the only time the BBC Symphony Chorus has performed Spem in alium in public. By the end of his period of tenure, the BBC Symphony Chorus had come to be widely regarded as one of the best amateur choruses in the world, singing some of the hardest pieces in the repertoire, with Stephen Jackson considered one of the world's most talented choir trainers, demonstrating "skill, musicianship, encyclopaedic knowledge and fervent passion" for the BBC Symphony Chorus. Notable events Blue Peter The Chorus took part in numerous Blue Peter Christmas shows and between 1983 and 2010. The grand finale of the traditional Blue Peter Christmas programme comprised the Chalk Farm Salvation Army Band and children from various schools, assisted by members of the BBC Symphony Chorus, marching "up the hill" and into the studio from the cold outside (lanterns in hand!) singing a Christmas carol around the Blue Peter Christmas tree. Two carols, "Hark! the Herald Angels Sing" and "O Come, All Ye Faithful", were sung in alternate years, except in 1998 when there was a one-off experiment with "O Little Town of Bethlehem". However, for the 2007 Christmas programme, leaving budgetary and studio constraints unspoken, Blue Peter decided on a change to the Christmas show format to host a party recognising the hard work and effort of young carers, relating to a recent Appeal. This event replaced the carol, and the Chorus was not required. In 2010 the closing carol was reinstated, featuring for one final time the Chalk Farm Salvation Army Band and members of the BBC Symphony Chorus, the last Christmas show before the programme moved to MediaCityUK. The Chorus featured occasionally in other editions of Blue Peter, notably in the programme on Monday 12 March 1984 (edition 1888). To publicise a concert at St Luke's Church, Chelsea, for The Knightsbridge Fund in aid of the victims of the Harrods bombing, Blue Peter invited the Chorus to the studio to sing the hymn "All people