It’s been an unthinkable seven years since The Knife — whose impending return to the active column is one of 2013’s most exciting musical developments to date — last graced us with their own album. But there’ve been no shortage of artists since then exploring the haunted, vocal-warping electropop otherworlds they thrust open. Perhaps none has done that more intriguingly and satisfyingly than Canadian twosome Purity Ring, whose slinky, surreally intoxicating confections draw equally on glitch, R&B and hip-hop (q.v. their recent collaborations with Danny Brown).
Tue., Jan. 29, 8:30 p.m., $15-$17, with Young Magic, Union Transfer, 1026 Spring Garden St., 215-232-2100, utphilly.com.