Pharrell Williams ‘Happy’ sold 6,455,000 downloads in the USA in 2014 making it the biggest selling song of the year. Pharrell’s best selling song sales figure is line-ball with last year’s biggest seller ‘Blurred Lines’ by Robin Thicke (6.498,000). However, overall digitals sales for 2014 are well down on 2013 figures. According to Nielsen Music,