Conversation so far:
What were Giuseppe Verdi's political beliefs?
Giuseppe Verdi began in 1859 to take an active interest in Italian politics. His early commitment to the Risorgimento movement is difficult to estimate accurately.
What were some of myths circulating around the 19th century about Giuseppe Verdi?
An example is the claim that when the Va, pensiero chorus in Nabucco was first sung in Milan, the audience, responding with nationalistic fervour, demanded an encore.
What effect did Giuseppe Verdi have on politics?
In 1848, the nationalist leader Giuseppe Mazzini requested Giuseppe Verdi to write a patriotic hymn.

Question: What did that lead to?
Self-contained rewrite: What did Giuseppe Verdi's involvement in politics lead to?