I was watching one of the new "river of chocolate" commercials for M&Ms. There was a woman singing petula clark's "color my world" I wanted to know the name of the artist singing in the commercial.

I think it was Nancy Stahl. Here is the copy from their news release webpage:

M&M'S® in color will be reintroduced to a national audience during the Thursday, March 11, primetime line-up on NBC in a series of advertisements that will trace the story of how color returns to the M&M'S® characters. A national multi-media advertising campaign entitled "River of Chocolate" will also begin on March 11, featuring colorful ads inspired by acclaimed artists including Nancy Stahl, Alex Weil, Alexander Gelman, Jonathan Adler, Mark Morris and Michael Rios.

Accually Nancy Stahl is a difrent type of artist. She makes consepual art wich was the inspiration for the river of colorful chocolate. Or maybe not or maybe both that she sings and illostrates... I want to find that song too. Seeing the add and hearing the song in the theaters is awsome... :-/URL

Not sure if this is what you are looking for, but I found the commercial at this website: http://webpub.allegheny.edu/employee/i/iroy/spring%202004/260/News%20Stories/Ad%20NewsStories%20Index.htm... just copy and paste the address.

Renee Cologne. I found it online and it is only about 3o seconds long so it could just be a sound bite from the ad. If you can find a longer version good luck to you.