The French composer was inspired by a translation of Goethe's dramatic poem "Faust" and produced a musical work that, like the masterpiece on which it is based, defies easy categorisation. Conceived at various times as a free-form oratorio and as an opera (Berlioz ultimately called it a "légende dramatique") its travelogue form and cosmic perspective have made it an extreme challenge to stage as an opera. Berlioz himself was eager to see the work staged, but once he did, he conceded that the production techniques of his time were not up to the task of bringing the work to dramatic life. Most of the work's fame has come through concert performances.