The operas 1 to 6 form a rich palette of about 60 solo, trio and quadro sonatas, which, because they are easy to perform and enjoy playing, are highly suitable for didactic purposes as an introduction...
The 3 sonatas are part of a vielle-sonata-convolute, whose discant 'makes do' with one melody line: thanks to their ideal range, they are ideally suited for playing on the alto recorder.
Sonata I: D major, II: G major, III: B flat major, IV: g minor
Sonata V: e minor, VI: B major, VII: a minor, VIII: e minor
Sonata IX: F major, X: B major, XI: C major, XII: F major
Rust's preference for the viola is also noticeable in this figuratively rich sonata with double stops. A challenge for experienced players.
Edited from the first edition.