In reply to Rocka.

That's kind of her point though. All of those artists you named who have had other singers provide vocal assistance on tracks have limited vocal abilities themselves or couldn't execute the notes the way the were intended to be. They NEEDED the help. For one reason or another. You can overlook it, but some people feel different. I agree with you that it's okay if it's not excessive but just because it's acceptable, doesn't mean that it's untrue or wrong to point out that the artist singing the song, could not in fact, successfully execute the notes on their own.