Hollywood lies again: One can get to 1.6 million Facebook friends (or "likes" to be precise) without making a few enemies. The endlessly likable Mumford & Sons has done what its old-timey indie predecessors could not do. It has taken the sound of mountain-range Americana and repopularized it at a global level without alienating its fanatical UK base. And the band has done so without surrendering to facile jamming or abandoning the uncanny elation of gospel music and the snarling soul of primitive rock & roll. To date, Mumford & Sons has released one album, 2009's Sigh No More, a collection of calamitous banjo-and-guitar-based anthems with mean percussion and glorious harmonies. Scalpers or not, it's no wonder the band's St. Louis debut sold out in 27 minutes.