Giovanni Salvatore was an Italian Baroque composer whose works reflect the school of Frescobaldi. This Capriccio is a structured exercise in imitation and rhythmic drive.
Maintaining precise rhythmic articulation throughout the imitative passages is the main technical goal.
Comparable difficulty and character — good candidates for what to learn next.
Capriccio del Primo Tono is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Capriccio del Primo Tono lasts about 3 minutes.
Capriccio del Primo Tono is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Capriccio del Primo Tonoo by Giovanni Salvatore, 13 Variations on 'Es war einmal ein alter Mann' by Ludwig van Beethoven, 21+26 by Alfredo Casella — see the full similar-pieces list on this page.