Numerous revisions and adaptations are entangled in the complex history of the work 'Tannhäuser'. After the world premiere in Dresden in 1845 had failed to be well received by the audience, Wagner revised large parts of the opera several times in the following decades. The most comprehensive changes were made for the Paris performance in March 1861, but even after that he made further revisions which superseded some of the previous changes and were performed in Vienna in 1875 among others.The st...