In 1980, Vanessa Briscoe Hay began the first tune on Georgia alt-rock band Pylon’s first album by singing, “Volume is pleasant. Volume is pleasant.” Today, making beautiful noise as the frontwoman for Pylon Reenactment Society, Briscoe Hay sings on “Magnet Factory,” the group’s debut album: “Sssshhhh! Generations of bands and trends have come and gone since Pylon’s heyday as a …