Grand Rapids, Michigan's Heaters essentially seem like the Mitten State's equivalent of Holy Wave, the Black Angels, and other staples of the flourishing Austin psych scene. The group excel at creating dazed but upbeat rhythms matched with swirling, foamy surf guitars and ethereal, reverb-soaked vocals. Matterhorn is their fourth album and first with a revamped four-person lineup, and while it isn't a grand departure from the group's previous work, it does seem a bit more fully realized. The band lock into Krautrock-esque grooves a bit more here, and there's a greater sense of control. The guitars are chiming and melodic while still sounding like the aural equivalent of reflections from a shimmering pool. It's rarely possible to discern any of the lyrics due to the massive amounts of effects, but they're included in the liner notes, and they're generally concerned with expanded consciousness and clarified vision, which seems appropriate for the group's most refined batch of songs yet. Highlights include the blazing yet bubbly "Thanksgiving II" and the altitude-cruising "Hochalga."