The second Mumford & Sons album ‘Babel’ is on track to become the fastest selling album of 2013 in the United States, outstripping the current US title-holder Justin Bieber. According to HitsDailyDouble.com ‘Babel’ looks set to crack the 600,000 sales mark next week. That is almost double Bieber’s ‘Believe’ earlier this year with 325,000. Pink