Simplify the following text for a Grade 10 native English-speaking person.
Original: According to his student , the renowned late 16th century music theorist Gioseffo Zarlino , Willaert went to Paris first to study law , but instead decided to study music .
Simplified: One of his students , Gioseffo Zarlino , who became a well-known music theorist , said that Willaert went to Paris first to study law , but then decided to study music .