Since the release of Wilder Mind in 2015, Mumford & Sons have experimented with breaking out of their folk rock bubble. Their new album, Delta, positions itself as a somewhat experimental, yet entirely familiar, addition to the band’s…

BERKELEY — “How many of you are students?” Marcus Mumford surveyed the packed crowd at UC Berkeley’s Greek Theatre Thursday night, the second of three consecutive sell-outs for London folk-rockers Mumford & Sons. “How many of…