Slick, far-reaching guitar lines, reinforced by splatterings of drums, create a sense of tension in motion on “Urgent Need to Leave,” courtesy of Philly four-piece Lightninging. The warmth of vocal harmony is countered by the sadness of a desire to depart. A controlled, combative, instrumental outpouring serves as scene-setting, mood-mimicking transitions. Channeling those feelings into fiery, doubled up, guitar bursts, the heaviness of the moment plays out in a melancholy manner.