You can use whatever type of chord you want to use- though using bar chords are a little more intermediate, I think it sounds better. Start by playing A and D while he's whistling When I was just a little boy I threw away all of my action toys While I became obsessed with Operation With hearts and minds and certain glands you gotta learn to keep a steady hand and thus began my morbid fascination Tore the spines from out of all of these self-help books Made myself a gun that not only shoots but looks so real Yeah, it shoots through steel with rays of dark matter Rays of dark matter It's really just the same through the rest of the song. It's an amazing song and easy to learn. I hope you have fun. d:)