Hi. Just to put you all out of your misery I can tell you that it is a mistake!! We have tried to tell most people of the mistake but you can never catch them all!! The answer is The Mousetrap but we know it isn't a musical!!! It was in a list of 'musicals' but after quiz was set we found out it was a 'play!'. If any problems when the quiz is marked then this question will be void. However, most people are putting the right answer anyway!! Hope this helps you all!!