Poised somewhere between the Andrews Sisters and Nouvelle Vague, the Puppini Sisters modernize vocal harmony pop while keeping its "so traditional, it´s hip" appeal. On their debut Betcha Bottom Dollar, the Sisters´ style is their substance; it´s not a coincidence that the founding Puppini, Marcella, worked for fashion icon Vivienne Westwood before forming the group. Fortunately, the trio´s style ? vintage ´40s outfits, cheeky covers of new wave and post-punk classics and all ? manages to stay on the likeable, not grating, side of kitsch. Taken individually, the trio´s voices aren´t spectacular, but they blend together nicely enough to create a convincing homage to the heyday of vocal harmony pop in the ´30s and ´40s. A very pleasant "Mr. Sandman," a pretty, languid "Java Jive" and "Sway" are among the best vocal pop standards on Betcha Bottom Dollar, but interestingly enough, the Puppini Sist