You want to know why Grandmaster Flash and the Furious Five deserve their induction into the Rock and Roll Hall of Fame? Then you gotta listen to this track and be convinced. This is from 1978 - before rap music ever hit the mainstream - and was recorded on tiny Enjoy Records. This was a monster hit in the boogie down Bronx, and is an extremely rare record to acquire today (especially the original 12-minute version, what you're hearing is the abbreviated 7-minute version).
The extended 12-minute version contains Melle Mel's rap track, "A Child is Born," which was later repurposed into the track "The Message" in 1983.