Simplify the following text for a Grade 10 native English-speaking person.
Original: A pupil of Charles Villiers Stanford and Walford Davies , Boughton 's output included three symphonies , several concertos , part-songs , songs , chamber music and opera ( which he called `` Music Drama '' after Wagner ) .
Simplified: Boughton studied with Charles Villiers Stanford and Walford Davies . He wrote many different kinds of music including symphonies , concertos , part-songs , songs , chamber music and opera .