premise: A song by Chaka Khan was released in the 20th century.
hypothesis: Chaka Khan ( born Yvette Marie Stevens , March 23 , 1953 ) is an American recording artist whose career has spanned five decades , beginning in the 1970s as the frontwoman and focal point of the funk band Rufus . Khan was the first R&B artist to have a crossover hit featuring a rapper , with `` I Feel for You '' in 1984 .