Read this and answer the question. If the question is unanswerable, say "unanswerable".

As musicians depended more and more on public support, public concerts became increasingly popular and helped supplement performers' and composers' incomes. The concerts also helped them to reach a wider audience. Handel, for example, epitomized this with his highly public musical activities in London. He gained considerable fame there with performances of his operas and oratorios. The music of Haydn and Mozart, with their Viennese Classical styles, are usually regarded as being the most in line with the Enlightenment ideals.

Handel gained considerable fame with performances of what two types of artistic work?
operas and oratorios