Sonata 5, in A major, is the only work in the set to feature the classic three-movement design in its symmetrical fast–slow–fast configuration. The opening Vivace makes considerable demands on the flautist’s technique, and the accompanist, too, has some lively interventions. A short Andante, in A minor, recaptures the style of the slow movement of an operatic sinfonia. High spirits return in the concluding Allegro comodo, which manages to be frothy and substantial at the same time. Sonata 6 is in G minor, traditionally a key for serious utterances. Its muscular opening Largo packs in a wealth of interesting rhythmic designs and articulations for the flautist. The influence of violinistic style is clearly seen in the Allegro that follows. The finale is composite: its frame is an Affettuoso in minuet rhythm, but its core is a Poco Allegro in G major with the character of a second minuet. Despite its outward charm, this movement retains much of the heft of the first two movements.