[Yardstick]

Yes, definitely Emmylou Harris. Aretha and Emmylou and after that I kind of lose interest.

The girl who sang backup on the Stones’ Gimme Shelter deserves some kind of special mention.

[ken5050]

Here's a few more "interesting voices"..though in no way suggesting that they're top 25 material...but they each had a unique sound, and were magnetic in concert..

1. Bonnie Tyler
2. Laura Brannigan ( sadly, died waaay to young)
3. Ronnie Spector ( of the Ronettes)

[dfwgator]

The girl who sang backup on the Stones’ Gimme Shelter deserves some kind of special mention.

Or the one who did the vocals on Pink Floyd's "Great Gig in the Sky."