This document provides background information on Giuseppe Verdi's 1851 opera Rigoletto. It discusses how the opera was controversial for its portrayal of immorality but became a masterpiece. It describes the main characters including Rigoletto, a hunchbacked court jester, and the curse that drives the plot. It also analyzes recurring themes in Verdi's operas like family relationships and how Rigoletto pushed boundaries with its portrayal of unusual relationships and asymmetric characters like the limping jester.