The freewheeling, improvisational nature of jazz music may seem at odds with the precisely arranged mechanisms used in watchmaking, but Ulysse Nardin has managed to bring both worlds together with its Jazz Minute Repeater. The new timepiece features a round onyx dial decorated with a scene of four jazz musicians performing on stage in front of a crowd. The musicians—hand carved in relief from 18-karat white gold—are called jacquemarts, a watchmaking term for figures that are animated upon the activation of the…