Tabs or chords to "How Bout' Us"

Does anyone know where I can find the tab or chords to a song by a group called Champaign?
The title is How Bout Us. I have the managed to figure out the majority of the song, but I need the part where it changes key after the second verse.  The song starts on a G and then goes to a Cminor.After the second verse, it goes to an Em and then I'm at a loss. Any help would be appreciated. Thanks