This is a ‘spot the mistake’ worksheet using a song as a means of bringing authentic language to the English class. Although it deals with listening and speaking most of the time, it´s supposed to provide reading, writing, listening and speaking practice. You can change the tasks according to your aims. A key is included. They lyrics were based on the version presented on the TV (Jimmy Fallon show) because, in my view, it was more appropriate to my teen students than the original version (see the link on the first page).