Detail from the autograph of the Cantata pastorale, 1716: Non sò qual più m'ingombra
Source: Musiksammlung der Staatsbibliothek, Berlin
Detail from the autograph score of Cantata da camera: Ombre tacite e sole, 31.10.1716
Source: British Library
Both the above cantatas are available for purchase through this site.
The Composer's Words
'I have marked ... at necessary places the louds and softs of the instruments, which are the only means of making that chiaroscuro which makes singing and playing attractive.'
(A. Scarlatti, on his opera, Il Gran Tamerlano 1706.)