The music of the cycle is thick and richly textured, and grows in complexity as the cycle proceeds. Wagner wrote for an orchestra of gargantuan proportions, including a greatly enlarged brass section with new instruments such as the Wagner tuba, bass trumpet and contrabass trombone. Remarkably, he uses a chorus only relatively briefly, in acts 2 and 3 of "Götterdämmerung", and then mostly of men with just a few women. He eventually had a purpose-built theatre constructed, the Bayreuth Festspielhaus, in which to perform this work. The theatre has a special stage that blends the huge orchestra with the singers' voices, allowing them to sing at a natural volume. The result was that the singers did not have to strain themselves vocally during the long performances.