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Recipient of the first Mendelssohn Prize, this composer wrote the tune to which the hymn "Onward, Christian Soldiers" is commonly sung. Although considered Britain's premier composer of the Victorian period, he wrote only one grand opera, _Ivanhoe_. Instead, his fame came from comedic operettas, including _Pirates of Penzance_, _HMS Pinafore_ and _The Mikado_. For ten points, who is this collaborator of William S. Gilbert?
Recipient of the first Mendelssohn Prize, this composer wrote the tune to which the hymn "Onward, Christian Soldiers" is commonly sung.
Arthur {Sullivan} (do not accept “Gilbert and Sullivan”)