Speaking of the number 13, revel in raucous ramblings at Low Spirits (2823 Second Street NW) on Wednesday, May 13, when Author & Punisher and Death Convention Singers invade the North Valley joint to provide a semblance of something called art rock. Author & Punisher is the techno-torture template that artist Tristan Shone uses to explore music in a disturbing fashion reminiscent of postmodern boundary dwellers like Survival Research Labs and Burque’s own Kris Kerby. A mechanical engineer by trade, Shone shines rather darkly within the doom-encrusted musical machinery of his own design. Current work includes the erotically charged, defiantly dissonant release Ursus Americanus.