In the duo composition 'In Nacht und Eis', as in her earlier work Torsion, Olga Neuwirth explores the extreme playing and tonal possibilities of the bassoon to which unusual tone colours are added, by accordion in this edition, by cello and ring modulator in another version. Irregular virtuoso passages, strings of static sounds and jagged chords piling up like ice floes give the work's title 'In Nacht und Eis' a concrete oppressive meaning.