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Musicmetric listed 20 artists whose work had been illegally downloaded 64.5 million times in 2013. About 70 percent of the downloads were albums; 30 percent were individual tracks.

Mr. Mars’s music accounted for 5,783,556 of those downloads, followed closely by Rihanna (5,414,166), Daft Punk (4,212,361) and Justin Timberlake (3,930,185). Other artists on the list include Flo Rida, Kanye West, Eminem, Jay Z, Maroon 5, Adele and Katy Perry (who holds the No. 20 position, with 2,318,740 downloads).

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– http://artsbeat.blogs.nytimes.com/2014/01/02/bruno-mars-tops-illegal-download-chart/?ref=todayspaper