These compilations were usually one to two hours long. They would splice together the most notorious clips from Ogrish.com, often set to an incongruous soundtrack: heavy metal (Slipknot, Cannibal Corpse), industrial music (Nine Inch Nails, Combichrist), or ironically cheerful pop songs (think "Raindrops Keep Fallin' on My Head" over footage of a suicide). The jarring contrast between music and image was a hallmark of the genre—a deliberate attempt to desensitize or shock the viewer further.
If you are looking for specific details about the in the collection or the soundtracks used, I can help you find those. Are you interested in the media history or the specific content of the mixtapes?