Offering up a mental and propulsive mixture of summery indie pop and meticulously crafted, commercial modern rock, Brooklyn-based American Authors fall someplace in involving the heady introspection of Alt J, the stadium-sized folk rock of Mumford & Sons, as well as the urban, heartfelt magnificence of Fun. Formed in Boston by Zac Barnett (vocals), James Adam Shelley (guitar/banjo), Dave Rublin (bass guitar), and Matt Sanchez (drums) while the four were attending the Berklee College of Music, the quartet eventually dropped out and relocated to Brooklyn, New York. American Authors inked a deal with Island Records in 2012 and released the singles “Believer” and “Best Day of My Life,” along with their eponymous debut EP, the subsequent year. Oh, What a Life, the group’s first long-player, followed in early 2014. They were originally known as the Blue Pages.