Well, I started out looking for Ray Charles singing Georgia on My Mind, but decided to go with this, a duet with Willie Nelson:
That video led me to this one (it was on the sidebar at youtube), Ray Charles singing Ring of Fire on Johnny Cash’s television show:
Which put me in mind of this, the great Frank Zappa singing the very same song, though you might never know it. Video terrible, but the music is great:
You can’t get anywhere that will pass the censors if you start with Frank, so I’ll stop here.