Sor’s fantasia op. 16 on Paisiello’s aria “Nel cor più non mi sento” is an extended set of variations using many of the different techniques possible on the guitar. It was first published in Paris in 1823.
This edition comes from the new 2020 second edition of Sor’s New Complete Works for Guitar edited by Brian Jeffery. The Introduction and Index to the entire series can be seen here on this site.