The plagal cadence, sometimes known as the Amen cadence from ecclesiastical use, is the progression from the chord of the subdominant to the tonic, IV - I.
Two patterns of air plane engine inlet hot-air anti-icer are introduced in this paper, one is circumferential anti-icer, the other is double skin corrugated chord direction anti-icer.
A barely audible ff septuplet of semiquaver chords and two rabid glissandi are thrown in by the soloist, before piano and bass section end the movement in five different Gs.