In what he described as 'an act of faith', Glock promoted in 1967 the first performance in England of the St Luke Passion by the Polish composer Krzysztof Penderecki – a modern re-working of the traditional large-scale Passion setting which made exceptional demands on the choir. The occasion was a great success, and was repeated in the Proms on 2 August 1967. A typical example of the extraordinary demands made on the chorus during the Proms each year was the succession of works performed during that season: in addition to the Penderecki, Mahler's Second Symphony, Walton's "Belshazzar's Feast", Liszt's "Faust Symphony", Berlioz's "Grande Messe des Morts", Delius's "Appalachia", Vaughan Williams's "Serenade to Music", Schubert's E flat Mass and Beethoven's Ninth were all sung.