16: Number of collaborations in the top 40.
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This Week's Chart By Numbers (3rd May 2015)
2. 16: Number of collaborations in the top 40.
There were a LOT of collaborations this bank holiday weekend with Wiz Khalifa and Charlie Puth's 'See You Again' the highest of all 16. Others included Alesso & Roy English, Iggy Azalea & Jennifer Hudson and Mark Ronson & Bruno Mars. Picture: Getty