Blue Highway played this in B. So, if you want to do it like them capo at the 4th fret and get crackin'! That being said, you can play any song in any key. It's all about what fits your needs or voice the best. Feeling lazy and just playing by yourself? Just play it in G. Feel like the vocal melody is just out of your range? Drop the capo back to the 2nd fret and play in A. Make the music work for you!