Bay Area trio OM have gradually slithered out of the doom-metal ghetto and into the mystical-psychedelia ghetto, while maintaining their polysyllabic, theosophical lyrical obsessions. Nobody can match bassist/vocalist Al Cisneros’s vocabulary and methodical, stentorian delivery. The former member of stoner-metal gods Sleep is a weed-tokin’ guru, delineating arcane rituals and scripture over sinuous, droning rock that bows eastward with gravity and grace. The vibratory beneficence OM bring cleanses the spirit; the music is high and mighty, with no headbanging necessary. (Highline, 210 Broadway E,, 8 pm, $12, 21+)