The song is called "The Flower Duet".
Here is the Wikipedia article: http://en.wikipedia.org/wiki/The_Flower_Duet
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If it is the current commercial playing June 2013, I believe the music is the opening orchestral music of Richard Wagner's Das Rheingold.
It's a version of the University of Michigan fight song
Which Commercial?
The song was created especially for the Pristiq commercial by a commercial music production company called Hidden Tiger Music. It was composed and produced by Gregg Fine. It is a fantastic piece.
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