This contrapuntal work includes a specific instruction to sing the fifth voice while playing, a hallmark of Frescobaldi's intricate keyboard writing. It highlights the Renaissance/Baroque transition toward dense, multi-layered textures.
Developing the ability to balance the played voices against the sung line is the central technical and musical hurdle.
Comparable difficulty and character — good candidates for what to learn next.
Capriccio di obligo di cantare la quinta parte, F 4.11 is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 8.
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 di obligo di cantare la quinta parte, F 4.11 lasts about 4 minutes.
Capriccio di obligo di cantare la quinta parte, F 4.11 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 Bergamasca by Girolamo Frescobaldi, Bergamasca, F 12.46 by Girolamo Frescobaldi, Capriccio di Durezze, F 4.09 by Girolamo Frescobaldi — see the full similar-pieces list on this page.