Claude Debussy: Prelude - La sérénade interrompue Book 1 No. 9 from Preludes - piano sheet music to print instantly. This piece is level 8+ and was composed during the Impressionism period. This piece is composed by Claude Debussy and was published in 1908. Title: Prelude - La sérénade interrompue, Book 1 No. 9 from Preludes. The difficulty level if graded by ABRSM would be approximately 8+ and it belongs to the Impressionism period.