It's all about those collaborations.
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This Week's Chart By Numbers (1st February 2015)

4. It's all about those collaborations.
There are currently TWELVE collaborations sitting in our chart at the moment. Jessie J teamed up with Nicki Minaj & Ariana Grande, Calvin Harris & Ellie Goulding have their second song 'Outside' sitting pretty at No.23 and Clean Bandit & Jess Glynne still have a track together in the top 40 too.