The normal version is alto voice, press space bar for the kitten version, up arrow key for tenor voice, right arrow key for squeak, and down arrow key for a giant voice. Yes I typed all of the lyrics, no I did not copy and paste. Except for when, well, I copied the lyrics to do different voices. But I typed all the lyrics on the first one.
In the normal version, the giant is the rap part and the squeak is the backround repeated parts (the bolt again, gain parts). If you have to change versions, press the stop sign then press that key. And press flag couple times.