“The Berlin-based singer Perera Elsewhere presented a capital-G Goth version of trip-hop on 2013’s Everlast, an album that was equal parts groovy and unsettling. Her voice was molasses slow, seeping in between the crevices of beats. The music she made existed in some strange continuum between Siouxsie and the Banshees and Massive Attack. Now, after a nearly four-year hiatus, she returns with “Somet”