S9.3. Technical challenges in the sinfonias: (a) the right hand must leap repeatedly and the inner voice is divided awkwardly between the hands, Sinfonia in D minor, BWV 790, mm. 5–6; (b) executing the ornaments requires changing fingers on sustained notes, Sinfonia in E-flat, BWV 791, mm. 33–35; (c) wide gaps between the three parts in a stretto-like passage require stretching more than an octave or releasing some notes earlier than the notation indicates, Sinfonia in B-flat, BWV 800, mm. 18–20