Amy Oelsner’s homemade pop songs sparkle with these eternal truths: that story-telling is part of being alive, and excavating the past is part of growth. Oelsner, who records as Amy O, is a lifer of the indie-pop underground for whom songwriting is a way of processing the passing of time. Her latest, Shell, brims with poetic granular details of everyday life; it’s her third studio album, and tenth including her many years of home recordings. Following 2017’s Elastic, Oelsner continues living up to that album’s namesake: Shell similarly stretches with melodies upon melodies. But here there is greater use of space and pace and patience. Perfectly minimal riffs slowly build, ebb, erupt and recoil; guitars and keys layer and swell; there are moments of steady piano-pop, intricate drums, and pristine criss-crossing vocal melodies.