For those in need of having their dervish whirled, the Bay Area's Fishtank Ensemble are the rompin', stompin' leaders of cross-pollinated Gypsy music. French fiddler Fabrice Martinez paid dues gigging Europe in a mule-drawn caravan, including stints in Romani villages. El Douje is the master of 21st-century flamenco guitar. Audience eyes tend to focus on Ursula Knudson, not only for her virtuosic saw playing and a voice that sings in octaves not yet invented, but also for her sensual beauty. The mix includes a ... rock-bottom upright bassist, and we have a young band that is one of the most thrilling live acts on the planet.