In an industry fueled by ego it's refreshing to hear two great emcees collaborate on a great album. With Watch the Throne and Hell: The Sequel being released, 2011 has seen two of the greatest collaborations of all time.

Some collaborations are just meant to be and when rappers like Method Man and Redman collaborate, it just sounds like they were born to rap on an album together.

Take a look as VladTV counts down the top 20 hip-hop collaborations of all time: