Rate Number: 2
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Christina Aguilera: 10
The funky masterpiece
Easily, the most experimental lead single ever of a pop gurl (at least off the top of my head). The Stripped era was risky, but it was more about concept and content, while B2B is much more musically experimental.
Fergie: 1
I'm sorry, but I normally don't consider a cover (from Heart) experimental, esp when the modern production only brings about a more mainstream sound to the interpretation