Symptoms of vocal nodes: "Here are symptoms that are warning signs of nodes or polyps: Auditory Signs: acute or chronic hoarseness; reduced vocal range; inability to sing at length; recurring laryngitis; a tonal change from a clear voice to one that's breathy, raspy, squeaky, foggy or rough; and the inability to project clearly."
I'm not saying he has vocal nodes or polyps, but if he does.....we know from the past how much he hates surgery. And who blames him!

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Strange Medicine Interview
http://youtube.com/watch?v=nZ6UzELue3o
In this video in 2005, his pitch seems the same and notice his voice is much less raspy. Very clear, etc.
http://youtube.com/watch?v=lb_ZSYPG6Nw
Sings "Dont Stop" with the White Sox. (Very much as sign that something is amiss.)
http://youtube.com/watch?v=504B3iR5M_8
2006 Meet and greet with fans. Voice sounds very raspy. Also shocked to see a pudgy looking Steve! The face was rounded, he looked short, somewhat fat, etc.
http://www.youtube.com/watch?v=RrCB1y555ss
In this (2007?) Ray foley interview the voice sounds raspy, you can hear it in the laughter the most.
http://youtube.com/watch?v=IE9Chh3hV9o