Simplify the following text for a Grade 8 native English-speaking person.
Original: His classical voice emerged in the course of his studies there under Maestro AndrÃ s Santa MarÃ a. During this time , he became a member of the Coro Nacional of Peru and sang as a soloist in Mozart 's Coronation Mass and Rossini 's Petite Messe Solennelle .
Simplified: His teacher AndrÃ s Santa MarÃ a found that he had a superb voice for classical music . He became a member of the Coro Nacional of Peru and sang as a soloist in Mozart 's Coronation Mass and Rossini 's Petite Messe Solennelle .