What album by American musician Prince was the first to feature his band The Revolution and had the contoversial song Darling Nikki which eventually led to the use of "Parental Advisory" stickers and imprints on album covers? 
Darling Nikki:  Partly because of the lyrical content of "Darling Nikki", Tipper Gore founded the Parents Music Resource Center, which eventually led to the use of "Parental Advisory" stickers and imprints on album covers.
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