CarnyMusic is the name San Francisco-based multi-intrumentalist, singer and songwriter Mike Carnahan gives to his latest project. A four-song, 18 minute set, this self-titled EP features somber, melancholy textures on “Riptide.” The spare funereal drum and insistent, folky acoustic guitar provide backing for Carnahan’s faraway vocal; some carefully-added sonic elements (keening and ghostly guitar lines,