There Are Rules

As they did in their first appearance (in "The Best with the Best to Get the Best [#2.3]") the conjoined twin violinists at Huber's Palace Museum simultaneously play the song "Tumbalalaika," a Yiddish folk song of Russian Jewish origin. Their captor Mr. Brockhurst tells a fanciful story of their Russian origins, and later the twins confirm to Thackeray that they really were from Russia originally (although the rest of Brockhurst's origin story for them is phony).