Wilco's 11th album, 2015's Star Wars, was a playful and angular set of noisy pop and pop-friendly noise, and it seemed fitting that it literally appeared out of nowhere, with the band sending it out as a free download without any advance warning one July afternoon. Little more than a year later, Wilco has released a follow-up, Schmilco, and in many respects this album is the flip side to Star Wars. Schmilco feels every bit as spontaneous as Star Wars (and much of the material was recorded during the same sessions), but where the earlier album seemed full of the joy of making music, this one is somber and low-key, a set of navel-gazing music even as the tunes confirm that Jeff Tweedy's way with a melody hasn't failed him. Acoustic guitars dominate most of Schmilco's 12 songs, with Tweedy's vocals right up front, sounding introspective and emphatic at once.