Although many factors can drive song sales, a new Nielson study suggests that viral videos play an increasing role - sometimes dramatically. Sales of Katy Perry’s “Peacock” spiked 64% within a month after Stephen Kardynal released his viral “Chatroulette Version,” well after Perry released her album. Similarly, sales of Robyn’s 2011 single “Call Your Girlfriend” increased 12% a month after sister-duo Lennon & Maisy uploaded their acoustic cover in 2012. And these aren’t the only songs that have benefited from being featured in viral videos: from Nielson Related articles VIRAL VIDEO: Lennon & Maisy AWOLNATION: More than just "Sail"

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