Nate Lacy of the band Mimicking Birds writes songs that are creepy without being, well, creepy. His band’s first album in four years is a subtly slithering sleeper, propelled by masterful songs like “Bloodlines.” That song contains what sounds like Eons’ mantra: “I am a creature / of mixed-up energies.” It’s an album of mixed-up energies, too, but “Eons” is also tightly coiled and wonderfully disciplined in its pacing. As a result, it’s not just mysterious; it’s legitimately suspenseful.