The backward glance is big right now; young acts across various genres and subgenres re-creating the aesthetics of earlier eras, often down to the half-decade. But when Umbrella Tree turns to history — as they do on their new album To the Memory of a Once Great Man — they do it their own way. That shouldn’t come as a surprise. Zachary Gresham, Jillian Leigh and Derek Pearson have been making and remaking their conceptual, theatrical lit-pop template since they first got rolling in the mid-Aughts. Now a quartet rounded out by Ryan LaFave, they’ve crafted a song cycle inspired by Napoleon Bonaparte. There’s nothing particularly militaristic or French or 19th century about the sound of it. If anything, it’s a work of forward-thinking indie rock deconstruction, and their first foray into drum programming. Nor do their lyrics parrot the history books. They go wherever their fertile imaginations take them.