21. The Preludio demands advanced bowing technique and consists almost entirely of semiquavers ( i . e . sixteenth notes ). 22. Although the head-motif in the fugue subject is unaltered, the semiquaver counter-subject is freely modified. 23. The second movement is a short and violent scherzo with syncopated rhythms and endlessly furious semiquaver ( sixteenth note ) passages. 24. The music proceeds with considerable violence, with relentlessly clashing dissonances in the woodwind and a plethora of racing string semiquavers . 25. The recorder ritornello is written in concertante style, with constantly flowing semiquaver figures, unhurried with no hint of virtuosity. 26. There is then a section where the left hand plays a sequence, followed by a right hand playing three semiquavers . 27. In the second section it is played against quavers; and in parts of the last, against running semiquaver passagework. 28. This arioso is accompanied by an ostinato movement in the continuo in " a semiquaver , quasi-Alberti figuration ". 29. The first movement is notable among Haydn's works for the use of tremolo notation as a shortcut for repeated semiquavers . 30. The animated semiquaver figure of the opening bars is played in imitation or in parallel thirds as a kind of moto perpetuo.
