Premise: Silvana, J. 87, is an opera by Carl Maria von Weber, first performed in Frankfurt am Main on 16 September 1810. The libretto, by , is a reworking of an earlier, unsuccessful opera by Weber, "Das Waldmädchen ". Weber also reused music from the same piece in "Silvana".
Hypothesis: Carl Maria von Weber ate a lot of sandwiches while creating "Silvana, J. 87".