The Seattle-based indie folk band Fleet Foxes has been on a bit of a break during the past three years. Lead singer Robin Pecknold announced in 2014 he’d be taking some time away from the group to attend Columbia University. But in June, he burst back onto the scene with the release of Fleet Foxes’ third studio album, Crack-Up. It’s perhaps the most ambitious project by the band known for idyllic, floating tracks such as “Mykonos” and “Montezuma.” This time around, the band has gotten even bigger, with nearly 20 musicians playing dozens of instruments to create a darker and more complex sound. Songs “Third of May / Ddaigahara” and "I Am All That I Need / Arroyo Seco / Thumbprint Scar" are cavernous and sprawling affairs that break down into instrumental jams with hints of the neo-folk sound that made the band such a breath of fresh air in the mid-2000s. The show will feature only a taste of these new tracks, however, interspersed with fan favorites and Pecknold’s soothing falsetto.