DJ Caz, Casanova Fly.

You'll know his name from Rapper's Delight - "I'm the C-a-s-an-the-o-v-a, and the rest is f-l-y" . Only he doesn't rap the lines - Big Bank Hank, his then manager does, having 'borrowed' his lyric books. 

You can hear the full story - and lots more insider tales of the New York hip-hop scene - from the man himself on the Birthplace of Hip Hop Tour with Hush Tours in NYC.