When music-lover Carl Zulehner from Mainz delivered the manuscript of this ‘Mozart’ mass to the publishers, it was accepted, published and was performed. It was later popular in the Victorian era, particularly in England. However, when Zulehner was challenged about its authenticity, he did not come forward with Mozart’s own manuscript. It is possible that Zulehner forged the work himself.Scholars also suggest attribution to Wenzel Müller, a Viennese composer of light opera. However, many works have been wrongly attributed to Mozart for many reasons. This particular one enjoyed a great following and the Gloria movement is still performed frequently and to great effect, particularly by amateur choirs.