Soviet Army dance ensemble + Run DMC "It's Like That" = Roots of Breakdance:
Via Kottke.org who writes:
...Here's the same thing mixed with Fatboy Slim's Weapon of Choice. Reminds me of the previously featured but still awesome video of Al Minns and Leon James doing the Charleston to Daft Punk. Here are two more videos that track the origins and breakdancing and hip-hop dancing in a slightly more formal manner: one, two.