Kent Isaacs has been known to work with an American rapper who is the "de facto" leader of what?
Kent (Gillström) Isaacs:  Isaacs has been known to work with Robyn, RZA, Slick Rick, Yusuf Islam (Cat Stevens), Clay Aiken, Eagle Eye Cherry, Infinite Mass, Arnthor and Stina Nordenstam (showcased on the hit 1996 soundtrack to "Romeo + Juliet"). RZA:  A prominent figure in hip hop, RZA is the "de facto" leader of the Wu-Tang Clan.
i don't know