Karl Gustaf Ingvar Wixell was a Swedish baritone who had an active international career in operas and concerts from 1955 to 2003. He mostly sang roles from the Italian repertory, and, according to The New York Times, "was best known for his steady-toned, riveting portrayals of the major baritone roles of Giuseppe Verdi — among them Rigoletto, Simon Boccanegra, Amonasro in Aida, and Germont in La traviata".

Rigoletto is an opera in three acts by Giuseppe Verdi. The Italian libretto was written by Francesco Maria Piave based on the 1832 play Le roi s'amuse by Victor Hugo. Despite serious initial problems with the Austrian censors who had control over northern Italian theatres at the time, the opera had a triumphant premiere at La Fenice in Venice on 11 March 1851.