What a week for Mumford & Sons. The British band's sophomore release, "Babel", moved a whopping 600,000 copies in its first week, according to Nielsen SoundScan, marking the biggest debut sales week of the year. It easily scores the group its first No. 1 on the Billboard 200 and the first for its label, Glassnote Records. (Even more stunning: "Babel" outsells the Nos. 2-8 albums on the Billboard 2
