Which American rapper co-wrote a song featured on the album unfold?
Unfold (Marié Digby album):  The album features the singles "Umbrella" (a cover of the Rihanna hit), "Say It Again" and "Stupid for You", and was released on April 8, 2008 in the United States via Hollywood Records. Unfold (Marié Digby album):  The album debuted at #29 on the Billboard 200 with 18,000 copies sold in its first week. Umbrella (song):  It features American rapper Jay-Z, who co-wrote the song with its producers Tricky Stewart and Kuk Harrell, with additional writing from The-Dream.
i don't know