Simplify the following text for a Grade 10 native English-speaking person.
Original: CuÃ nod was known for his roles as Basilio in Mozart 's The Marriage of Figaro , the Astrologer in Rimsky-Korsakov 's The Golden Cockerel , and Sellem in Stravinsky 's The Rake 's Progress .
Simplified: CuÃ nod sang music by many different composers . He was famous for singing the part of Basilio in Mozart 's The Marriage of Figaro , the Astrologer in Rimsky-Korsakov 's The Golden Cockerel , and Sellem in Stravinsky 's The Rake 's Progress .