Chamber choir Ad Parnassum presents a special program around the premiere of Jan-Peter de Graaff's Dies Irae. Ad Parnassum works closely with soprano and artist-in-residence of the festival, Elisabeth Hetherington. In addition, mezzo-soprano Lotte Betts-Dean, percussionist Konstantyn Napolov and wind ensemble The Brabant Orchestra will participate. The company performs compositions for mixed choir, wind ensemble and percussion. Jan-Peter de Graaff writes a new monumental choral work at the request of Ad Parnassum, who also performs works by Daan Manneke and Igor Stravinsky.