On their third and final album, slowcore savants Rex conclude their discography with a whisper, then a crash. Always innovative and never stagnant, 3 is an exercise in restraint. Hushed guitars and barely-there drums create an arcadian feel, until the sound explodes in a ménage of strings, from cello to viola to violin. Several tracks follow this pattern, like “Yah Land,” which builds to a splintering instrumental climax. Other tracks, like the Greek bouzouki-driven “Waterbug,” remain tranquil throughout, evoking English folk-rock more than Rex’s slowcore brethren. Dynamic and sprawling, 3 is a testament to Rex’s cross-genre genius.