Not always true about a UM Producer doing that. iTunes uses a database from a company called GRACENOTE for that information:
http://en.wikipedia.org/wiki/Gracenote
This explains why often times the information from iTunes is wrong and not 100% reliable [[it's happened quite a few times to me on various releases). I'm not saying Valerie didn't sing on these songs, I'm just saying that the fact that the downloaded information via iTunes/Gracenote said she did doesn't mean anything other than someone submitted that information. And that someone could be anyone with an internet connection and not someone in a position to speak with authority on the matter.
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