For 10 points, name this composition by Hector Berlioz.
In this work's third movement, the oboe plays behind the scenes during measures 3-20, then returns to the orchestra. The third movement of this work depicts a "Scene in the Fields" in which two young shepherds, represented by an English horn and an oboe, alternate playing a Swiss mountain melody called the "ranz des vaches." An obsession with an actress named Harriet Smithson inspired this five-movement work, which uses a single melody called the "idee [EE-dey] fixe." The fourth movement of this work, which is entitled "March to the Scaffold," depicts a beheading by guillotine. For 10 points, name this composition by Hector Berlioz. 
In this work's third movement, the oboe plays behind the scenes during measures 3-20, then returns to the orchestra.
Symphonie Fantastique [or Fantastical Symphony] 