Hip hop pioneer who has a street named after her in Philadelphia (I don't think she's ever followed the "Need You Now" band in concert, but it would be logical)
Down
1D
King of Celesteville
2D
Caution color
3D
"And others"
4D
Taylor or Landers
5D
"Righteous" alternative
6D
Famed dancer (he knew all the steps, in case you were wondering)
7D
Some quadrilaterals
8D
Main language in Pakistan
9D
Pals
10D
Get ___ (advantage for top seeds, some times)
18D
Fauna
19D
Masc. opposite
21D
"If looks could kill" looks
22D
"[T]he flame of the blue star of twilight, hung low on the rim of the sky/Has ___ in our hearts, my beloved, a sadness that may not die" (William Butler Yeats, "White Birds")
23D
Who, according to Patrick Swayze, does what I've done in this grid ("Dirty Dancing" reference)