This song has a 4/4 time signature, in the key of E. What I call an "E9" is a barre chord on the ninth fret, as opposed to an E1, which is the standard open chord. The A2 is a normal A played with only the pinky and ring fingers. There are three chord progressions: one for the introduction and verses, another for an instrumental section, and a third for the chorus. There is a tag at the end of the second chorus, and some changes at the end. If you have any questions, post them below an (guitaretab.com)