Some speculate that Sussmayr might have taken as much credit as possible. Furthermore, Sussmayr gave no credit to Eybler. Part of the unfinished work of Mozart's Requiem was performed privately in a theater as a tribute to Mozart. It is assumed that Constanze passed off Sussmayr as one of Mozart's students who helped him write the score while he was ill in order to make Walsegg believe that the Requiem was entirely Mozart's work. However, there is no solid evidence to support this hypothesis. Constanze even claimed that Mozart sang certain sections of Sussmayr. Many wonder which parts were written by Eybler, Sussmayr and Mozart. Many claim that Constance is responsible for the confusion over who wrote what. After receiving a commission for the Requiem, she cautiously presented the Requiem as a work by Mozart. To ensure that Walsegg would not take credit for this piece. Additionally, she also received money every time the Requiem was performed publicly. All of Constance's assertions contributed to the mystery of the Requiem. It's complicated to determine which of his claims are completely false and which are half-truths or half-truths.