Help with this style?

http://www.youtube.com/watch?v=LEZ3ccYNVQ4

http://www.youtube.com/watch?v=3WwT8h_Z … re=related

So, I can easily sing all the notes in both of these videos, but I was wondering how I can do that bluesy shout he does on the higher notes? I'd like to be able to do it without screwing my voice up... Any suggestions?