Stevie Wonder put in a surprise appearance at Sunday night's concert in Inglewood bringing together four queens of R&B.

And Sia, 47, and Chaka Khan, 70, put on an electrifying performance ... Sia looked vibrant in a rainbow smock dress hat was hand-painted with cartoon characters and embroidered multicoloured ...

Khan took to the Tiny Desk stage, where she sang some of her biggest hits including “I’m Every Woman” and “Tell Me Something Good,” in celebration of Black Music Month. Chaka Khan proved ...