Oxygen dropped this piece of history in my mailbox in december 2009. It's the full recording of the Wyandance High School Jam from 1985, including the pre-party featuring another local crew and became one of my most viewed, discussed en cited blog posts.
Wyandanch High School Jam (1985)
Featuring: Biz Markie, Kid Wizard Rakim, MC Chilly Dawg, Grandwizard BMC & DJ Fantasy, Inc.
(1 of 2): The pre-party festivities jumped off by DJ Fantasy, Inc. rocking over the vintage 'beatbox' drum machine.
(2 of 2): The main event featuring Biz Markie with DJ Grandwizard BMC (from the group Groove B. Chill) joined by MC Chilly Dawg(aka Daryl "Chill" Mitchell, also from Groove B. Chill). Later on, a VERY SPECIAL impromptu guest appearance from none other than the Kid Wizard Rakim Allah!!! He drops a couple of verses including the epic '7 mc's'(track #10 in the folder)
I take 7 MC's put 'em in a line
Add 7 more brothas who think they can rhyme
Well, it'll take 7 more before I go for mine
Now that's 21 MC's ate up at the same time
Check also http://www.jesseserwer.com/blog/?p=272