louis-hector berlioz (11 december 1803 – 8 march 1869) was a french composer. he was one of the greatest composers of the 19th century. his music is typical of the romantic period: full of passion and often based on ideas outside music. he was not particularly good at playing any instrument, but he was brilliant at writing for the orchestra. some of his most famous works include several orchestral overtures, the "symphonie fantastique", the opera "les troyens" ("the trojans"), the requiem "grande messe des morts" and the song cycle "les nuits d'été" (summer nights). he was very original as a composer, and his music was not fully appreciated until many years after his death.