Often considered the father of twentieth-century music, Debussy was a visionary whose influence is still felt. This Companion offers new insights into Debussy's character, his environment and his music, including challenging views of the roles of nature and eroticism in his life and music. While works in all genres are discussed, they are considered through the themes of sonority, rhythm, tonality and form, with closing chapters considering the performance and reception of his music in the first years of the new century.