Now, now, Ray. Let's not go getting all racial. There's a significant history of sampling and remaking rock tunes for rap/hip hop tracks. To Conan's disclaimer, some would argue that Run DMC pioneered fusion of the two genres, or three if you separate rap and hip hop
Billy Squier - Big Beat sampled by Run DMC, UTFO, Big Daddy Kane, Tribe Called Quest, Jay-Z
Lou Reed - Walk on the Wild Side sampled by Trribe called Quest
Doors - Five to One sampled by Jay Z
LZ - When the Levee Breaks/The Ocean sampled by Beastie Boys
Jefferson Airplane - Today sampled by Black Sheep
Steely Dan - Peg sampled by De La Soul
The Clash - Straight to Hell sampled by M.I.A
Van Halen - Jamie's Crying sampled by Ton Loc
Aerosmith - Dream On basically remade by Eminem
Black Sabbath - The Wizard sampled by Cypress Hill
Slayer - Angel of Death sampled by Public Enemy
Black Sabbath - Black Sabbath & LZ - When the Levee Breaks sampled by Ice T
Van Halen - Ain't Talking About Love sampled by 2 Live Crew
B,S&T - You Make Me So Very Happy sampled by Ol' Dirty B@stard
Bad Brains - Re-Ignition sampled by Chubb Rock
Just to name a few. Add to that there're examples of white rappers in this list and an all black hardcore punk band, and it'd be fairly safe to say that music transcends constraints of race and ethnicity