Ruth B.’s nimble, soulful voice is the driving force behind her elegant, stirring pop music. Social media success led her to a record deal and to release 2015’s sparse The Intro EP, which set her vocals front and center above bright piano; she flies to Neverland on the searching “Lost Boy” and tells a working-class love story with “2 Poor Kids.” On her debut full-length, Safe Haven, she turned to lusher instrumentation on songs like the groove-driven “Superficial Love” and created string-swept choruses on “Dandelions.” “Rare” renders big feelings in hushed tones and tinkling piano, highlighting her unique means of expression.