I've been listening, and watching a lot of Clarence Bekker vocals lately... especially those he's done with the Playing For Change organization... His "A Change Is Gonna Come" is, dare I say it, absolutely mind-blowing... perhaps even better than the original. I'd always thought Richard Manuel's version of Dylan's "I Shall Be Released" couldn't get any better, but Bekker made me re-think that as well.  What an amazing voice!