What’s so scary about Pluramon’s fifth album, The Monstrous Surplus? After all, the group fronted by Marcus Schmickler trades in melodic, gossamer indie pop tunes with heavenly vocals from Julee Cruise, Julia Hummer, and Jutta Koether. Echoes of Mazzy Star drift through wistful numbers like “Can’t Disappear” and “If Time Was on My Side,” which simmer sweetly rather than explode with wanton noise. These reserved motifs make Surplus a compelling listen, with Schmickler’s electronic programming a fitting accent to his traditional band gear. The mix comes together on “Snow Bow,” where Cruise coos, “A spell has been cast/There’s no way to resist,” as Schmickler’s guitars swirl and swoon around her pristine pipes. This monster is scary-good!