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I watched Rod Stewart on The Graham Norton Show last night - He's always got a twinkle in his eye. He sang an old classic which was very smaltzy and I normally wouldn't like it but he totally nailed it and got away with it. He has a very soulful voice no matter what he sings. He's so versatile 
Deary deary me Robin.... your musical integrity has just gone down in my estimation.... Rod Stewart couldnt sing his way out of a wet paper bag.
....You and I have quite different musical tastes, Rich - I don't strive for what music intellectuals call "musical integrity". When I listen to a singer I listen to more than technical ability or range - I listen to the
SOUL in a singer's voice. Rod Stewart has plenty of soul and often sounds like his hero Sam Cooke. For me it's simply whether a voice tugs the emotions or not and when I use the term "emotions" I don't mean only the sort that bring on a tear in the eye. Jo Cocker, Mick Jagger, Prince, Sinatra, Ray Charles, Otis Redding, Randy Crawford, Robert Plant, and dozens of others. The chappie you play for (Tony Christie?) has a voice which leaves me cold - No soul.
Music is what moves the Body and the Soul.