Oh Snap is certainly, in any event, her most endearing album, and that’s no faint praise. Salvant was already full of surprises, but the latest twist in her path turns out to be a near-perfect pop album. Oh Snap isn’t altogether a pop album in style, although it does broach the form. It’s a pop album in the sense of indulgence, in the projection of personality. The songs on Oh Snap began as experiments, exercises and amusements, recorded on her phone, edited and augmented on her laptop.