After the three-track Time Enough At Last, Antigone returns with Ostinato for TOKEN75. As a project, the record is thematically accurate, adhering to its title’s suggestion on both sides. The tracks play with layering techniques, gradually building a spectrum of sound around their respective persistent motifs. Antigone shifts these insistent base elements, allowing them the foreground before masking within a blend of carefully processed and organic-sounding details.    Ostinato 1 is mild and disconcerting, with strings that verge on unnatural in their high pitch. Ostinato 2 is more traditionally dramatic, the space this time filled with keys that follow the ongoing theme, building to an ostentatious crescendo reminiscent of the roots of trance.