Rossini’s Aureliano in Palmira is a rarity for a whole host of reasons. There’s no definitive edition. Many of the extant scores have much easier versions of the main arias for the tenor titular character. Quite a bit of the music was reused for Il barbiere di Siviglia, often in ways that seem quite odd after hearing it in its original context. Finally, the plot is a bit thin. Not that that usually worries bel canto aficianados.