“I don’t know how to feel things small,” Sophie Allison sings at the outset of her new album’s closing track. “It’s a tidal wave or nothing at all.” The Soccer Mommy auteur’s songs have always exemplified that truth. Allison can distill a roiling cauldron of emotions into streamlined bursts of melody, sketching out vivid scenes and internal monologues with her moonbeam of a voice. This, plus her knack for nifty chord-based guitar riffs, was central to Soccer Mommy’s appeal back when Allison was a teenager recording on a four-track at home in Nashville, and all of those skills remain crucial selling points here in her mid-twenties. But on Sometimes, Forever — the third Soccer Mommy album, out this week — she’s a long way from muddy DIY recordings.