“Heart of Darkness” by New Jersey/Brooklyn’s Ruby Bones is all energy, all the time. As a frantic shot in the dark combatting aging’s cruel hand, the three-piece outfit garners their indie-rock sentiments to form the invigorating jam session that is this track. It acts as a reminder to hold on to your youthful vigor, because with settling comes bitterness and resentment. The band takes a quintessential alt-rock chorus and amps it up a few notches with rapid drum fills and roving guitar lines. Expect a debut full-length album fueled with vivacity later this spring.