5 Weeks: James Arthur - 'Say You Won't Let Go'
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The Longest Reigning No.1 Singles In Big Top 40 History
9. 5 Weeks: James Arthur - 'Say You Won't Let Go'
The Chainsmokers were ready to nab the top spot for an entire month before James Arthur made a HUGE charge for the top spot and snatched the No.1 spot mid-way through September 2016 to then go on a hot run throughout most of Autumn.