Mike Farris used to sing for a rock band in the 90's called the Screamin' Cheetah Wheelies. He's now clean and sober and sings old school blues-based gospel. I've seen him a couple of times, and he always puts on an amazing show. So much soul and passion in his voice. Give it a listen.
http://www.youtube.com/watch?v=cqnJ0kRVRY4&feature=related
http://www.youtube.com/watch?v=zSZ-odOHqgI&feature=related
http://www.youtube.com/watch?v=wKo7hVPOaIM&feature=related