Sor’s Souvenirs d’une soirée à Berlin op. 56 was published in Paris in 1833-35. Sor had passed through Berlin in 1823 on his way to Russia, and probably again on his return to Paris in 1827. The piece (after the introduction) is a single long swirling waltz and could be splendid in performance. If it recalls an evening in Berlin, was the event a ball, perhaps? Or a ballet at a theatre?
This edition comes from the new 2019 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.