Gnarls Barkley - 'Crazy'
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13 Songs You Won't Believe Are 10 Years Old In 2016
4. Gnarls Barkley - 'Crazy'
The debut single from Cee-Lo Green and Danger Mouse's act 'Gnarls Barkley' became the BIGGEST track of 2006 - it even became the first ever single to top the charts JUST from downloads alone.