7 Weeks: Mark Ronson & Bruno Mars - 'Uptown Funk'
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The Longest Reigning No.1 Singles In Big Top 40 History #OWNED
14. 7 Weeks: Mark Ronson & Bruno Mars - 'Uptown Funk'
The current record holder is...Mark Ronson and Bruno Mars' 'Uptown Funk'! The single's chart dominance spanned over both 2014 AND 2015 after it was rush released following Fleur East's unforgettable performance of it on The X Factor.