"Libro Duetti e Terze[tti]; dell'Illmo
Gaetano Guadagni", with the title page "Duetti diversi", including 22 numbered duets mainly for two sopranos and continuo, a few for soprano and alto, notated on up to nine staves per page, including 'Ti lascio amata Clori', 'L’alma da lacci sciogliere' (by Hasse), ' Se vi dicessi ch’io sono amante' (arietta
for soprano and continuo), 'Se amor per me non senti' (by Jommelli), 'Semplicette pastorelle', 'Or che del bel mattino', and several "Terzetti diversi", including 'Pastorella al colle al prato' (Metastasio), 'Ahi che l’un de Geni nostri' (Cesarotti) and many others,
143 pages, small oblong 4to, 16 x 22.5cm, 10-stave paper with ruled margins, watermarks of 3 hats above letter M and 3 crescent moons etc, contemporary mottled calf, gilt border flowers to corners, early ownership inscription ("Mrs G. Ellis, Sunning Hill near Staines"), possibly Viennese provenance (third quarter of the eighteenth century?), with a few nineteenth-century additions at the end of the manuscript.